Andrea Is Team Leader of the Focus Group at Her

Andrea is team leader of the focus group at her organization. In the past, the group was plagued by lack of cooperation and disrespect. Today, she told team members that if anyone tried to undermine another member, that person would be kicked off the team. This is an example of a(n) :

A) critical event.
B) explicit statement.
C) experiential carryover.
D) implied norm.
E) first-behavior precedent.