Adolescents tend to group together with people who share some characteristics. These large groups are known as:

The correct answer is A. crowds.

Crowds are large groups of adolescents who share certain characteristics, such as interests, behaviors, or social status. While cliques (C) are smaller, more intimate groups where members have close personal relationships, crowds represent a broader category of grouping. Dyads (B) refer to pairs of individuals, and friends (D) indicate a one-on-one relationship.