The project manager should educate the new sponsor about the agile approach for project delivery, which is an iterative and adaptive way of working that focuses on delivering value to the customer and responding to change. The project manager should also explain how agile teams are self-organized, meaning that they have the autonomy and authority to plan, execute, and monitor their own work, without excessive control or interference from the sponsor or other stakeholders. The project manager should emphasize the benefits of self-organization, such as increased motivation, collaboration, innovation, and quality. The project manager should also clarify the role and responsibilities of the sponsor in agile projects, which include providing vision, funding, support, and feedback, but not micromanaging or dictating the work of the team. 123 References:
* 1: What is agile project management? - APM
* 2: What is Agile? - Project Management Institute
* 3: Role of Project Sponsor in Agile Project Management - PM Majik

According to the Professional in Business Analysis (PMI-PBA) Guide, a minimum viable product (MVP) is a version of a product that has enough features to satisfy early customers and provide feedback for future development. A MVP is a way of delivering value to customers quickly and iteratively, while minimizing waste and risk. In this scenario, the project manager is faced with a drastic reduction in the project timeline, from 18 months to six months. This means that the original scope and schedule are no longer feasible, and the project manager needs to find a way to deliver a product that meets the customer's needs and expectations within the new constraints. Reviewing the project backlog and prioritizing the high-value items that can be delivered in six months is a sensible approach to achieve this goal. The project manager can then work with the stakeholders to define and agree on the MVP that will provide the most value to the customer and the business. This option also allows for flexibility and feedback, as the MVP can be refined and improved based on customer feedback and changing requirements. Planning for overtime, applying crashing and fast tracking, and sharing the risk of failure are options that try to compress the schedule without reducing the scope. These options may increase the cost, quality, and resource risks, and may not be acceptable to the stakeholders or the customer. Seeking approval to triple the project budget and hiring more people is an option that tries to increase the resources without reducing the scope. This option may not be feasible or realistic, as it assumes that the sponsor is willing and able to provide the additional funds, and that the project can benefit from adding more people in a short time. This option may also introduce communication, coordination, and integration challenges, and may not guarantee the delivery of the product in six months. Going over the critical path with stakeholders and explaining why it is not possible to deliver all the scope in the expected timeline is an option that tries to justify the original plan without considering alternatives. This option may not be satisfactory to the stakeholders or the customer, as it does not offer any solution or value proposition. This option may also damage the relationship and trust between the project manager and the stakeholders, and may result in the cancellation or termination of the project. Conclusion: Given the options, Option B stands out as the most viable and effective action. Reviewing the project backlog and coming up with a MVP that fits the expected timeline addresses the customer's needs and expectations, delivers value quickly and iteratively, and minimizes waste and risk. Among the presented choices, Option B emerges as the optimal solution. PMP Exam Content Outline Mapping Domain Task Process Task 2: Execute the project Topics Covered Minimum Viable Product (MVP) Project Backlog Prioritization Value Delivery References: (Professional in Business Analysis Reference Materials source and documents)
* Professional in Business Analysis (PMI-PBA) Guide, Chapter 5, Section 5.3.1.2
* A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Seventh Edition, Chapter 5, Section 5.2.2.2
* The Standard for Project Management - Seventh Edition, Chapter 3, Section 3.2.2.2

The project manager should first meet with the project sponsor to clarify how the benefits from the project align with the organization's vision. This is because the project sponsor is typically responsible for the business case and will have insight into how the project fits within the larger strategic context of the organization. The benefits management plan should reflect the organization's strategic objectives, and the project sponsor is the key link between the project team and the organization's leadership.
References:
Benefits Realization Management Practice Guide1
Benefits management - Project Management Institute2
The aligned organization - McKinsey & Company3
Project Benefits Management Plan: PMP Exam Master Tips4
Benefits Management for Projects: Making a Benefits Management Plan5

Root Cause Analysis (RCA) is a systematic process used to identify the source of a problem and find a solution that prevents the problem from returning. It involves a collaborative effort where all team members can contribute to identifying the root cause. Facilitating a meeting where everyone can share their ideas ensures a comprehensive analysis and that all potential contributing factors are considered1. References: = Root Cause Analysis Steps PMP Exam Guide1; Root Cause Analysis for Business Analysts2.

Agile measurements, such as the delivery of incremental working products, can improve upon predictive measurements by providing tangible progress and value at regular intervals. This approach is particularly beneficial when the final stages of a project are delayed, as it ensures that the customer continues to receive functional components of the product. This method aligns with the agile principle of delivering working software frequently, from a couple of weeks to a couple of months, with a preference to the shorter timescale1.
References:
37 Agile Metrics - The Complete Guide for Agile Teams1
Agile Practice Guide | Project Management Institute2
Agile project management and the PMBOK guide3