A public service ad advises people not to drive after drinking until you feel safe to drive. However, in a study conducted by hospitals, subjects who were immediately asked after drinking often underestimated what they need to restore their driving ability This result suggests that it is difficult for people who drink before driving to follow the advice of this ad. Which of the following, if true, would best support the above conclusions:. ['Subjects studied in the hospital estimate their ability to resume driving is generally more conservative than others.', 'The subject of the hospital study was also asked about the time required to restore the ability to not play an important role in safe driving.', "Some people who have to drive home don't drink.", 'General people are more alert to PSAs than hospital research subjects.']