Final answer:
The earliest agent of socialization is typically the family, which shapes a child's early behavior, communication, and cultural understanding.
Step-by-step explanation:
The earliest agent of socialization for an individual is typically the family. Socialization is the process by which individuals learn and adapt to the norms, values, and behaviors that are deemed appropriate in their society. The family plays a fundamental role because it is the first social context a child is exposed to, and it significantly shapes the child's behavior, attitudes, and understanding of the world. From the moment a child is born, family members begin to teach the child how to communicate, interact, and behave within their cultural context. Therefore, the correct answer to the student's question is (b) Family.