The correct answer is A - Work with the team to improve collaboration by fostering group decision-making and conflict resolution techniques.
One of the core principles of Agile is self-organizing teams. Teams must learn to make decisions collaboratively. If they are struggling, the Scrum Master or Agile Coach should facilitate improved team dynamics, encouraging consensus-building and effective conflict resolution techniques such as consensus, dot voting, or facilitation.
From the PMI Agile Practice Guide:
"Agile teams are empowered to make decisions. Coaches support this by teaching group decision-making techniques and fostering a culture of psychological safety and collaboration." (PMI Agile Practice Guide, Section 6.2 - Coaching the Agile Team) Mike Griffiths highlights:
"When teams hesitate to make decisions, the coach's role is to facilitate better team dynamics-not to make decisions for them. Group decision-making leads to greater commitment and alignment." (Mike Griffiths, PMI-ACP Exam Prep Book, Chapter 4 - Team Performance) Why other options fall short:
* B gives decision-making power to the Product Owner inappropriately for technical matters.
* C fragments accountability and may cause misalignment.
* D may help in leadership development but doesn't guarantee collaborative decision-making.