Commercial Passenger Airplanes can be equipped with a collision-avoida

Commercial Passenger Airplanes can be equipped with a collision-avoidance radar system that provides pilots with information about the proximity of other airplanes. Because the system warns pilots to take evasive action when it indicates a possible collision, passengers are safer on airplanes with the system than on comparable airplanes not so equipped, even though the system frequently warns pilots to evade phantom airplanes.

Which one of the following is an assumption on which the argument depends?


A) Passengers feel no safer on airplanes equipped with the radar system than on comparable airplanes not so equipped.

B) Warnings given by collision-avoidance system about phantom radar signals are not caused by distorted radar signals.

C) The frequency of invalid warnings will not cause pilots routinely to disregard the system’s warnings.

D) Commercial passenger airplanes are not the only planes that can be equipped with a collision-avoidance system.

E) The greatest safety risk for passengers traveling on commercial passenger airplanes is that of midair collision.