Final answer:
The primary microsystem of adolescents is the Family, as it provides the earliest and most continuous form of socialization. During adolescence, peer groups become key socialization agents, yet family influence remains substantial even as youth seek independence and form new emotional bonds outside the family.
Step-by-step explanation:
The primary microsystem of adolescents is C. Family. While peers play a significant role in an adolescent's socialization, it is the family that typically serves as the earliest and primary agent of socialization. From a young age, children are influenced by their parents and the norms within the household. This early socialization forms the basis for their moral and ethical values. As adolescents, they start to develop an identity independent from their parents, and peer influence becomes more prevalent, particularly in providing social experiences outside the realm of the family.
Peers become crucial during adolescence as young individuals engage in various activities with them that differ from family interactions, helping them to further develop their social skills and personal identity. This is also the period when many adolescents form their first romantic relationships and emotional bonds outside the family. However, the influence of the family remains significant, often providing a balance to peer influence. Hence, the correct answer to the question is primarily Family, but with a recognizing note on the increasing important role of peer groups during adolescence.