Answer:
The correct option is groupthink, option C
Explanation:
Synergy is combining individual efforts together in order to achieve more than it is possible individually, a concept of 2 plus 2 equals 5.Hence, the question is not about achieving more in a group, so it is not about synergy.
Groupthink is the concept of reasoning a single team where individual reasoning or creativity is subordinated to group thinking and sometimes leading sub-optimal decisions been made,that was exactly the case of Jeff and his team