Answer: B - Groupshift.
Explanation:
When any group comes together and has different views it can cause a groupshift. This is different than having a discussion, conformity, role conflicts, etc. The groupshift will usually go for the most extreme ideas out of all others and go with that instead. It only takes one vocal person in the group to shift the ways the others think and change the views they had before the meeting.
The most dominant speaker in the group will be the one to persuade the others to join in their views and therefore making it a groupshift.