A sign in an eye clinic advises people

A sign in an eye clinic advises people who have received eye drops that blur vision to refrain from driving until they can do so safely. In a hospital study, however, subjects questioned immediately after they received such drops underestimated the time necessary to regain their driving ability. This result indicates that many people with eye drops will be unlikely to follow the advice.

Which of the following, if true, most strongly supports the argument above?

 (A) Many people, if they know they will receive eye drops, make arrangements beforehand for a friend or relative to drive them home.

(B) The subjects in the hospital study generally rated their abilities more conservatively than they would if they were outside the framework of a scientific experiment.

(C) Some people ask their doctors not to give them eye drops that blur vision if they will have to drive to get home afterward.

(D) The subjects in the hospital study were also questioned about the time necessary to regain abilities that do not play an important role in driving safely.

(E) Awareness of the sign is higher among the general population than it was among the subjects in the hospital study.  


The best answer is B.  The sign advises people to drive only when they are able to do so.  According to choice B, patients are unable to determine correctly when they are fit to drive.  This supports the conclusion that many people will not follow the advice on the sign.