The number of aircraft collisions on the ground is increasing because of the substantial increase in the number of flights operated by the airlines. Many of the fatalities that occur in such collisions are caused not by the collision itself, but by an inherent flaw in the cabin design of most aircraft, in which seats, by restricting access to emergency exits, impede escape. Ttherefore, to reduce the total number of fatalities that result annually from such collisions, the airlines should be required to remove all seats that restrict access to emergency exits. Which one of the following, if true, provides the most support for the proposal? ['The number of deaths that occurred in theater fires because theater patrons could not escape was greatly reduced when theaters were required to have aisles leading to each exit.', 'In the event of fire, public buildings equipped with smoke detectors have fewer fatalities than do public buildings not so equipped.', 'Removing the seats that block emergency exits on aircraft will require a costly refitting of aircraft cabins.', 'In the event of collision, passengers on planes with a smaller passenger capacity generally suffer more serious injury than do passengers on planes with a larger passenger capacity.']