Final answer:
A sociologist observing behavior at a college football game would likely study c) the interaction among fans during tailgate parties.
Step-by-step explanation:
A sociologist observing behavior at a college football game would probably focus on the interaction among fans during the pre-game ritual of tailgate parties.
This is because sociologists study social interactions among groups of people, and tailgate parties are a common social activity associated with football games.
By observing how fans interact, sociologists can gain insights into group dynamics, social norms, and cultural practices surrounding football game events.