Safety consultant: Judged by the number of injuries per licensed vehicle, minivans are the safest vehicles on the road. However, in carefully designed crash tests, minivans show no greater ability to protect their occupants than other vehicles of similar size do. Thus, the reason minivans have such a good safety record is probably not that they are inherently safer than other vehicles, but rather that they are driven primarily by low-risk drivers. Which one of the following, if true, most strengthens the safety consultant's argument? ['Minivans generally have worse braking and emergency handling capabilities than other vehicles of similar size.', 'When choosing what kind of vehicle to drive, low-risk drivers often select a kind that they know to perform particularly well in crash tests.', 'Judged by the number of accidents per licensed vehicle, minivans are no safer than most other kinds of vehicles are.', 'Minivans tend to carry more passengers at any given time than do most other vehicles.']