According to the PMBOK Guide, planning poker is a technique used to estimate the size of user stories in agile projects. It involves each team member privately selecting a card with a number that represents the relative size or complexity of a user story, and then revealing their choices simultaneously. The team then discusses the reasons for the differences and repeats the process until they reach a consensus or an acceptable range. This technique helps the team to avoid anchoring, groupthink, and estimation bias, and to consider different perspectives and assumptions. By continuing multiple rounds of planning poker, the team can improve the accuracy and reliability of their estimates and plan their iterations more effectively. References:
PMBOK Guide, 7th edition, page 309; Agile Estimation Techniques for the PMP Exam

EVA is a method of measuring project performance by comparing the actual work done, the planned work, and the budget. It helps to determine the project's progress, efficiency, and profitability. EVA is a useful tool for agile projects, as it can provide timely feedback and allow for adjustments as needed12.
The other options are not as relevant or effective for illustrating the project's performance in an agile context:
A). Results of the MoSCoW assessment: MoSCoW is a prioritization technique that helps to classify the project requirements into four categories: Must have, Should have, Could have, and Won't have. It helps to focus on the most important and valuable features for the customer. However, it does not measure the project' s performance or progress3.
B). Cost-benefit analysis: Cost-benefit analysis is a technique that compares the costs and benefits of a project or a decision. It helps to evaluate the feasibility and profitability of a project. However, it does not reflect the project's performance or progress, especially in an agile environment where the scope and requirements may change frequently4.
C). Return on investment (ROI) analysis: ROI analysis is a technique that measures the profitability of a project or a decision by comparing the benefits and costs. It helps to assess the value and impact of a project.
However, it does not indicate the project's performance or progress, especially in an agile environment where the benefits and costs may vary over time.

Explanation:

In an agile project, the Definition of Done (DoD) is a shared understanding among the team about what it means for work to be complete. This includes the completion of all user stories and meeting all acceptance criteria. If the sprint goals were not met, but there were no defects for the new user stories and no new requirements were discussed, it indicates a possible misalignment between the team's understanding of the DoD and the product owner's expectations. To avoid such situations in the future, the project manager should review the DoD with the product owner to ensure that everyone has the same understanding of what it means for work to be complete1.
: Agile project management focuses on continuous improvement, scope flexibility, team input, and delivering essential quality products2. Agile project management approaches include scrum as a framework, extreme programming (XP) for building in quality upfront, and lean thinking to eliminate waste1. These and many other agile methodologies have in common flexible scope, frequent interaction, and delivering working, tested software2.

According to the PMBOK Guide, the project manager is responsible for managing the project resources, including materials, and ensuring that they are available and delivered on time. The project manager should also monitor and control the project risks, and implement appropriate responses when they occur. If one important material is still not on site and the delivery date is approaching, the project manager should engage the project team to look for alternatives to find a solution. This means that the project manager should involve the team members who have the relevant expertise, knowledge, and skills to identify and evaluate possible options to overcome the problem, such as using a substitute material, changing the design or scope, or negotiating with the supplier or the client. Engaging the project team to look for alternatives to find a solution will help the project manager to leverage the collective intelligence and creativity of the team, and to find the best solution that meets the project objectives and satisfies the stakeholders. Recording it in the risk register is not a sufficient action, as it does not address the problem or prevent the delay. The project manager should have identified and recorded this risk earlier, and developed a contingency plan to deal with it. Asking the client to help solve the problem is not a good option, as it may damage the relationship and trust between the project manager and the client, and imply that the project manager is not capable of managing the project. The project manager should communicate the problem to the client, but not rely on the client to solve it. Starting procuring this material from another supplier is a risky and costly option, as it may not guarantee the quality, availability, or delivery of the material, and it may incur additional expenses and contractual issues. The project manager should consider this option only after exhausting other alternatives, and with the approval of the relevant stakeholders. References: PMBOK Guide, 6th edition, pages 355-356, 441-442, 456-457.