Answer:
a. Socialization
Explanation:
Socialization is the process of learning or adapting behaviors, skills, values and knowledge of a society or a culture. The norms of the social group or culture is transferred to a new person or member that joined the group. In other words, socialization occurs when an individual internalizes the norms of a articular social group including the family, community, school etc.
An example could be new friend adapting the values and attitudes of a particular social group.
Marie's experience in the lunchroom as she watches others and followed their leads is socialization.