According to the Text, a Group Is Defined as "Two

According to the text, a group is defined as "two or more persons who are interacting with one another in such a manner that each person influences and is influenced by each other person". Which of the following is an aspect of this definition?

A) An individual can only belong to one group.
B) Group members interact with, but do not influence, each other.
C) It includes the concept of the one-way nature of influence between leaders, followers and situation.
D) It incorporates the concept of reciprocal influence between leaders and followers.