Airline: Newly developed collision-avoidance systems, although not fully tested to discover potential malfunctions, must be installed immediately in passenger planes. Their mechanical warnings enable pilots to avoid crashes. Pilots: Pilots will not fly in planes with collision-avoidance systems that are not fully tested. Malfunctioningsystems could mislead pilots, causing crashes.

The pilots' objection is most strengthened if which of the following is true?

• AIt is always possible for mechanical devices to malfunction.  
• BJet engines, although not fully tested when first put into use, have achieved exemplary performance and safety records.  
• CAlthough collision-avoidance systems will enable pilots to avoid some crashes, the likely malfunctions of the not-fully-tested systems will cause even more crashes.  
• DMany airline collisions are caused in part by the exhaustion of overworked pilots.  
• ECollision-avoidance systems, at this stage of development, appear to have worked better in passenger planes than in cargo planes during experimental flights made over a six-month period.