Drug manufacturing giant Pfizer will soon package its drugs for adults

Drug manufacturing giant Pfizer will soon package its drugs for adults in a new type of bottle that, for adults, will be much easier to open than Pfizer’s current, child-resistant bottles. Unfortunately, the new bottle will also be somewhat easier for young children to open, and last year, 18 percent of accidental poisonings of young children by prescription drugs involved their grandparents’ medicine. Probably, then, Pfizer’s new bottle will cause an increase in these accidents.

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

A. Pharmaceutical drugs manufactured by Pfizer accounted for several of last year’s accidental poisonings of young children by their grandparents’ medicine.
B. Pfizer’s new bottles, like those they will replace, carry a large-print warning urging customers to keep the bottle out of reach of children.
C. Many adults find Pfizer’s current bottles so frustrating to open that they frequently do not reclose those bottles after use.
D. Pfizer’s new bottle is indistinguishable from its current bottle except for the shape of the cap.
E. Adults generally try to keep their medications completely inaccessible to young grandchildren