Social stratification is best defined as:

Social stratification refers to the hierarchical arrangement of individuals or groups within a society based on various factors such as wealth, income, race, education, and power. This concept illustrates how society is structured in layers or tiers, where some individuals have greater access to resources and opportunities than others.

The correct answer highlights this essential characteristic of social stratification as it emphasizes the organization of societal members in relation to one another based on differing levels of status and privilege. This framework is crucial for understanding how inequality is produced and maintained in societies, influencing individuals' life chances and access to resources.

The other options describe aspects of social interaction and community dynamics but do not capture the essence of social stratification. The process of social networking pertains more to personal and professional connections rather than societal hierarchy. Community engagement focuses on the participation of individuals in community activities but does not address the structured inequalities present within society. Classifying groups based on shared interests relates to specific social affiliations rather than the broader systematic inequalities that characterize social stratification as a whole. Understanding social stratification is essential for analyzing societal dynamics and addressing issues related to inequality and social justice.