Explanation:

In an agile project environment, collaboration and flexibility are key. When an SME external to the project team offers a suggestion that could expedite project delivery, it is beneficial to leverage their expertise. The project manager should facilitate collaboration between the current team members and the SME to integrate the suggestion effectively. This approach aligns with agile principles, which prioritize individuals and interactions over processes and tools, and responding to change over following a plan12.
References:
Agile Methodology in Project Management as a Licensed PMP2.
5 Lessons on How Agile can Solve SME's Engagement Issues1.

In a situation where a team member is not knowledgeable about the technology solution, it is essential to address this knowledge gap to prevent any negative impact on the project's productivity, especially under strict time constraints. Option B is the most suitable as it provides a structured approach to learning and ensures that the team member gains the necessary knowledge in a formal setting. This approach is more likely to result in a thorough understanding of the technology, which is critical for the project's success.
The answer is supported by the best practices outlined in the Project Management Body of Knowledge (PMBOK Guide), which suggests that project managers should develop their team's competencies to enhance project performance. Additionally, the Professional in Business Analysis (PMI-PBA) reference materials emphasize the importance of training and skill development to equip team members with the necessary tools and knowledge to contribute effectively to the project.

According to the PMBOK Guide, one of the tools and techniques for developing the project management plan is expert judgement1. This involves obtaining guidance and advice from knowledgeable and experienced individuals or groups, such as subject matter experts, consultants, industry associations, or professional and technical organizations. By consulting a senior project manager within the organization, the project manager can leverage their expert judgement to understand the interdependencies of the work items, the industry standards and best practices, and the organizational processes and policies that may affect the project planning. The other options are not appropriate, as they do not address the issue of the project manager's lack of familiarity with the industry and the work items. Consulting the project sponsor, the product owner, or the senior developer may provide some useful information, but they are not the best sources of expert judgement for the project manager in this situation. References:
* 1: PMBOK Guide, 6th edition, page 89

According to the PMBOK Guide, a project issue is a point or matter in question or in dispute, or a point or matter that is not settled and is under discussion or over which there are opposing views or disagreements1. A project risk is an uncertain event or condition that, if it occurs, has a positive or negative effect on one or more project objectives2. A risk response strategy is a specific action or set of actions to be taken to address a risk3.
In this scenario, 1600 rpm is a project issue because it is a point of dispute between the risk owner and the project team, as it causes the system to stop working and crash. 1500 rpm is a project risk because it is an uncertain event that, if it occurs, has a negative effect on the project objective of delivering a functional power engine. 1400 rpm is an event that triggers a risk response strategy because it is a specific action taken to reduce the power and brake the engine to avoid the risk of reaching 1500 rpm or 1600 rpm.
References:
1: PMBOK Guide, 6th edition, page 89
2: PMBOK Guide, 6th edition, page 720
3: PMBOK Guide, 6th edition, page 395