Some 70 percent of consumers polled at an upscale. . .

[Vincen]

Some 70 percent of consumers polled at an upscale supermarket said that they did not care for the taste of Apex toothpaste. Nonetheless, sales of Apex accounted for a full 75 percent of toothpaste sold at that supermarket. The conclusion that at least 75 percent of shoppers buying toothpaste did in fact enjoy the taste of Apex toothpaste relies on the assumption that ___________________.

Question:
Which of the following best completes the passage?

A) most of the shoppers polled did not make any toothpaste purchases that day.
B) most shoppers who bought Apex did so because of its proven efficacy in fighting tooth decay.
C) nearly every shopper who bought Apex did so because he or she did not like its taste.
D) a large number of shoppers polled were dental professionals.
E) shoppers will not buy a certain brand of toothpaste if they do not care for its taste.

The OA is E.

What is wrong with options A and B?