Final answer:
Socialization during childhood involves learning cultural norms and has a significant impact on personal identity, occurring through interactions with various agents like family, peers, and social institutions.
Step-by-step explanation:
The process of socialization during childhood is multifaceted and does not occur exclusively within one setting or stage of life. It is incorrect to state that socialization only happens within the family unit (a) or solely during adolescence (b), as socialization involves various agents and continues throughout a person's life. A true statement about socialization is that it involves learning the cultural norms, both material and nonmaterial, of a society (c). Furthermore, socialization has a significant impact on developing one's personal identity. It does not occur in a vacuum but rather through interactions with family, peers, and formal and informal social institutions like schools and media (d).