Which chapter is located at Trinity College?

Phi Psi is the correct answer because Phi Psi is a well-known fraternity that has a chapter located at Trinity College. Each of the options listed represents a different fraternity or society, and in this case, Phi Psi maintains an active presence at that particular institution. This connection is significant as it highlights the relationship between specific fraternities and their affiliated universities. Other options, such as Phi Phi, Beta Phi, and Psi may reference other fraternities or societies, but they do not have the same established presence at Trinity College, making Phi Psi the accurate choice.