If You Wanted to Determine Whether Evaluation Apprehension or Simple

If you wanted to determine whether evaluation apprehension or simple arousal accounts for social facilitation in humans,which of the following studies would you conduct?

A) Loiter in a health club locker room, either with or without dark glasses, a white cane, and a seeing-eye dog, (or else hide in a locker) ; measure how long it takes people to dress after a shower.
B) Ask people to solve easy or difficult crossword puzzles, either alone or with their friends; measure how long it takes them to solve the puzzles.
C) Conduct either a complicated or simple survey, by phone or in person; measure how long it takes people to answer the questions.
D) Ask people to participate in an archery exercise, either with friends or with strangers; count the number of bull's-eyes they make.
E) Ask people how they feel in a crowded classroom before a difficult exam.