Final answer:
The sociological significance of social structure is that it influences how we act by creating patterns of expected behavior that are learned through socialization, making it fundamental in maintaining societal order.
Step-by-step explanation:
The sociological significance of social structure is that it has a major effect on how we act. Social structure provides a framework that organizes routine activities and prescribes a set of expected behaviors in different contexts, affecting individuals' social standing and behavior patterns. Social roles, social norms, and the material and non-material aspects of sociological phenomena play a significant role in our lives by creating predictable patterns of behavior that are learned through the process of socialization. This structure is critical because it helps uphold societies and informs how people interact, shaping their roles and expected behaviors within different settings.
Considering this, the correct answer to the student's question is:
a. It has a major effect on how we act.