sport-utility vehicles have become extremely popular because

sport-utility vehicles have become extremely popular because of the robust and energetic image they project. although these vehicles look sturdy, they are subject to only a small fraction of the safety standards the government imposes on ordinarly passenger cars. consequently, a high-impact collision involving both a passenger car and a sport-utility vehicle is much more likely to injure the latter and not the former.

each of the following serves to strengthen the conclusion above except

1. those who design vehicles are inclined to make them safe only if government rules dictate that they must
2. sport-utility vehicles have a higher center of gravity, which makes them more susceptible to turning over in a collision
3. the government rigorously enforces its standards for maximum roof strength and impact resistance in all passenger cars
4. sport-utility vehicles are less aerodynamic than passenger cars, and this extra bulk hinders their ability to accelerate
5. people who drive sport-utility vehicles are often instilled with a false sense of security and therefore neglect to wear their seatbelts