A group is broadly defined as
a. an aggregate of individuals sharing some common characteristics. b. two or more individuals who share a set of norms, values, or beliefs and have certain implicitly or explicitly defined relationships to one another such that their behavior is interdependent.
c. an aggregate of individuals whose presumed perspective or values are being used by an individual as the basis for current behavior.
d. two or more individuals whose behaviors are interdependent.

B. Two or more individuals who share a set of norms, values or belief and have a certain implicitly or explicitly defined relationships to one another such that their behavior is interdependent.

Explanation: A group is simply composed of more than one person, and as such members of a group have something in common, it could be a behavior, attitude, like or anything which is common to all members of the group. A group usually possess a relationship pattern which may be lucid or very obvious and sometimes may not be known to others people outside their group that is they exhibit a a sort of positive correlation and as such members of the group exhibit a mutual dependence on one another.

answer; (b) binge eating disorder;