What term describes a person who understands the roles they are expected to fulfill and is both willing and capable of performing them?

Explanation

The correct answer is A: successfully socialized. This means the individual comprehends their expected social roles and is prepared to act accordingly. Options B and C refer to forms of influence or training but do not capture the full concept of social integration. Option D refers to a person significant in one's life, not the state of adopting social roles.