Jeff Is Asked What Main Dish Was Served for Lunch

Jeff is asked what main dish was served for lunch at the cafeteria yesterday.He thinks it was roast beef but,before responding,he observes six other students who say the main dish was pizza.Under which of the following circumstances is Jeff most likely to say the main dish was pizza?

A) if he hears the response from the six other students in three pairs of two
B) if he hears the response from all the students at once
C) if he hears the response from the six students at six different times in six different places
D) if he hears the response from the six other students in two pairs of three