After Spending Years Trying to Understand What Factors Lead to Successful

After spending years trying to understand what factors lead to successful teams, Google concluded that some key factors were

A) The feelings that each group member had about the other at a personal level.
B) The team's positive impact and psychological safety of the group.
C) That meetings ended on time and that the team was rewarded for its performance.
D) Understanding of the group's personality and having a process for handling groupthink.