Question ID:PT88 S4 Q23 Passage:Safety expert: Conversing on a cell phone while driving is more dangerous than conversing with a passenger in the vehicle. The person talking with the driver on a cell phone is unable to see the driving situation and, hence, cannot immediately recognize situations in which driving becomes difficult. In contrast, a passenger in the vehicle will usually be quiet or even provide helpful warnings in such situations. Stem:Which one of the following is an assumption required by the safety expert's argument? Correct Answer Choice:AChoice A:Speaking to a driver during a difficult driving situation significantly increases the risk of an accident, unless the speaker is providing helpful warnings. Choice B:A driver having a conversation with a passenger in the vehicle during a difficult driving situation is not substantially more likely to have an accident than is a driver who is not conversing during a difficult driving situation. Choice C:People who use cell phones while driving generally believe that talking on a cell phone does not increase their risk of being in an accident. Choice D:Helpful warnings given to a driver in a difficult driving situation are as likely to distract the driver as to help the driver in controlling the car. Choice E:Conversing on a cell phone while driving is no more dangerous than conversing with a passenger in the vehicle who continues to speak during difficult driving situations.