GWD-12-Q15 求助！

purpleelf

FastMart, a convenience store chain, is planning to add pancake syrup to the items it sells.  FastMart stores do not have shelf space to stock more than one variety of syrup.  Surveys of FastMart customers indicate that one-fourth of them prefer low-calorie syrup, while three-fourths prefer regular syrup.  Since FastMart’s highest priority is to maximize sales, the obvious strategy for it is to stock regular syrup.

Which of the following, if true, most seriously weakens the argument?

A.    People buying pancake syrup at convenience stores, unlike those buying it at supermarkets, generally buy it only a few times.
B.    People who prefer low-calorie syrup generally use about the same amount of syrup on their pancakes as those who prefer regular syrup.
C.    Regular syrup does not sell for a higher price per unit than low-calorie syrup.
D.    In general, customers who prefer regular syrup will buy low-calorie syrup if regular is unavailable, but those who prefer low-calorie will not buy regular syrup.
E.    Sales of syrup are not expected to account for a large proportion of total dollar sales at the average FastMart store.

好像没有相关问题的帖子，我怎么搜也搜不到。。。请哪位高人指点一下