B
The cafeteria at Acme Company can offer only four main dishes at lunchtime, and the same four choices have been offered for years. Recently mushroom casserole was offered in place of one of the other main dishes for two days, during which more people chose mushroom casserole than any other main dish. Clearly, if the cafeteria wants to please its customers, mushroom casserole should replace one of the regular dishes as a permanent part of the menu. The argument is most vulnerable to criticism on the grounds that it fails to consider
A: what foods other than main dishes are regularly offered at lunchtime by the cafeteria
B: a desire for variety as a reason for people's choice of mushroom casserole during the days it was offered
C: the proportion of Acme Company employees who regularly eat lunch in the company cafeteria
D: whether other meals besides lunch are served in the Acme Company cafeteria