Question ID:PT26 S2 Q10 Passage: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 equipped with the system than on comparable airplanes not so equipped, even though the system frequently warns pilots to evade phantom airplanes. Stem:Which one of the following is an assumption on which the argument depends? Correct Answer Choice:CChoice A:Passengers feel no safer on airplanes equipped with the radar system than on comparable airplanes not so equipped. Choice B:Warnings given by a collision-avoidance system about phantom airplanes are not caused by distorted radar signals. Choice C:The frequency of invalid warnings will not cause pilots routinely to disregard the system's warnings. Choice D:Commercial passenger airplanes are not the only planes that can be equipped with a collision-avoidance system. Choice E:The greatest safety risk for passengers traveling on commercial passenger airplanes is that of a midair collision.