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?
【选项】People buying pancake syrup at convenience stores, unlike those buying it at supermarkets, generally buy it only a few times.