Answer: The correct option is A: Symbolic interactionism.
Explanation:
Symbolic interactionism refers to people's interaction with objects, events, and behaviors based on the meaning related to those things. People's idea about something comes from the interactions they have with others and society. For that reason, symbolic interactionism is the most appropriate theoretical approach the sociologist might use because he can analyze the interactions between Occupy members regarding the idea they have in common: the economic disparity between the highest economic class and the mid to lower economic classes.