Correct Answer: C
Explanation
The project manager should meet with the team to review internal actions to resolve the situation, because this is a common practice in agile project management. In agile projects, the team is empowered to self-organize and adapt to changing requirements and circumstances1. The iteration retrospective is a meeting where the team reflects on what went well and what can be improved in the next iteration2. If the team realizes that the complexity of the work was underestimated, they should discuss how to adjust their planning, estimation, and delivery processes to avoid this issue in the future3. The project manager should facilitate this discussion and support the team's decisions. References:
1: A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Seventh Edition, Chapter 2, Section 2.2.3
2: A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Seventh Edition, Chapter 2, Section 2.3.3.5
3: A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Seventh Edition, Chapter 2, Section 2.3.3.6
4: A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Seventh Edition, Chapter 2, Section 2.3.3.7