Socialization is the process by which individuals learn and adopt the behaviors, values, and norms of a group or society. It is a lifelong process that begins in childhood and continues throughout life, helping individuals understand how to function within society.
Stratification refers to the hierarchical division of society, bureaucratization involves the development of formal rules and structures, and alienation refers to the sense of disconnection individuals may feel from their work, society, or culture. Therefore, socialization is the correct concept.