The project manager should meet with the team member's functional manager to try to remove the impediment that is preventing the team member from completing their user story. The project manager should explain the impact of the delay on the project scope, schedule, and quality, and negotiate a solution that would allow the team member to resume their work on the user story as soon as possible. This approach is consistent with the agile principle of removing impediments and enabling self-organizing teams12. References: 1:
PMBOK Guide, 6th Edition, Chapter 5: Project Scope Management 2: Agile Practice Guide, Chapter 2: An Agile Mindset

In Agile environments, value delivery is driven by an actively managed and prioritized product backlog.
When a customer feels that value is not being delivered according to the original scope, the first action the project manager should take is to ensure the backlog accurately reflects customer priorities. The Product Owner is responsible for backlog prioritization, but the project manager facilitates stakeholder engagement and ensures that feedback leads to backlog refinement.
According to the Agile Practice Guide, "Backlog refinement is a key mechanism to adjust scope and priorities throughout the project." Misalignment between delivery and customer expectations often originates from improper backlog management.
Options A and B refer to logs that track issues and changes, but these are reactive records and don't directly address value delivery. Option D (risk register) deals with potential problems, not actual missed value.
References:
Agile Practice Guide, Section 5.3: Product Backlog and Prioritization
PMBOK Guide - Seventh Edition, Value Delivery and Adaptive Planning
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Addressing a team member's feeling of lack of skills is best approached by discussing their growth and development needs and providing appropriate learning opportunities. This aligns with the principles of supporting continuous professional development and building competencies within the team. By engaging in a dialogue about the team member's aspirations and challenges, the project manager can tailor a development plan that includes training, mentorship, or stretch assignments to help the team member acquire the necessary skills and confidence to handle new tasks. This approach not only addresses the immediate issue of demotivation but also contributes to the team member's long-term growth and the overall capability of the team.
: Based on the best practices for team development and motivation as outlined in PMI's resources1234, and the principles of professional development for business analysts567.

In this scenario, the organization is exploiting a risk management strategy. Exploitation is a strategy used in positive risk management or opportunity management. It seeks to make sure the opportunity is realized. By assigning the most talented resource to the project, the organization is trying to exploit the opportunity to finish the project earlier than planned.
: PMBOK Guide, 6th Edition, Section 11.5.2.1, Strategies for Opportunities. The PMBOK Guide is a foundational standard from the Project Management Institute (PMI) that provides guidelines for managing individual projects and defines project management related concepts. It also describes the project management life cycle and its related processes, as well as the project life cycle. The PMBOK Guide is process-based, meaning it describes work as being accomplished by processes. This approach is consistent with other management standards such as ISO 9000 and the Software Engineering Institute's CMMI. Processes overlap and interact throughout a project or its various phases. Processes are described in terms of:
Inputs (documents, plans, designs, etc.)
Tools and Techniques (mechanisms applied to inputs)
Outputs (documents, products, etc.)