The correct answer is B - Ensure there is a balanced mix of people who are experts and members with broad experience based on the work to be performed and determine training needs.
Scrum encourages cross-functional, self-organizing teams with complementary skills. Building a balanced team that reflects both depth and breadth of experience ensures optimal delivery while enabling team learning.
From PMI Agile Practice Guide:
"Agile teams are cross-functional. The team may need T-shaped skills-members with deep expertise in one area and a willingness to broaden knowledge in other areas. Creating balanced teams with knowledge diversity leads to better collaboration and learning." (PMI Agile Practice Guide, Section 4.1 - Building Agile Teams) Mike Griffiths adds:
"Team selection should prioritize diversity of skill sets and the ability to collaborate, not just performance history. The goal is a team that can deliver value collectively, not as individuals." (Mike Griffiths, Chapter 4 - Team Performance) Why the other options are not suitable:
* A may reduce team diversity and discourage healthy conflict resolution.
* C may not be feasible in distributed environments and is not a strict requirement.
* D focuses on individual velocity contributions, which contradicts Agile's team-based delivery focus.