The correct answer is D -- Assume the team member's tasks to meet iteration goals and notify the Product Owner. Agile teams are self-organizing and accountable. High-performing teams take ownership of shared goals and redistribute work as needed to maintain commitment.

From the PMI Agile Practice Guide:

''High-performing agile teams collaborate to deliver sprint goals, adapting to changes such as unavailability of team members. They adjust workload and communicate impacts transparently.''

(PMI Agile Practice Guide, Section 4.3 -- Team Performance and Self-Organization)

Mike Griffiths explains:

''When team composition changes, the team must redistribute work to ensure delivery. Ownership, trust, and flexibility are core traits of high-performing agile teams.''

(Mike Griffiths, PMI-ACP Exam Prep, Chapter 4 -- Team Performance)

Incorrect options:

A signals dysfunction and abdicates team responsibility.

B implies external management of team staffing.

C violates the principle of self-organization.