Peer groups are important to adolescents because: 1. They help to develop a sense of identity separate from adolescents' parents. 2. They provide the second major socialization experience outside the realm of their families. 3. They rank higher in importance to adolescents' than parental influence. 4. They help exert dependence among adolescents.

1.

Explanation:

A peer group is a group of people who belongs to the same age and social status. They do not necessarily need to be friends, but they do share the same interests.

The socialization in peer groups is important when a child enters adolescence. In such groups only, do the adolescents find their own identity. They begin to develop a sense of individuality and independence from their parents. Though this finding of individuality stands in conflict with the parental norms, yet, it is important.

So, the correct answer is option 1.