GMAT Critical Reasoning (CR) | Re: More airplane accidents are caused by pilot error than any o

More airplane accidents are caused by pilot error than any other single factor. The military recently stopped requiring pilots to obtain immunization shots against chemical warfare agents. The shots are known to cause unpredictable dizzy spells, which can result in pilot error. Since many military pilots also pilot commercial passenger airlines, the reason for the military's decision must have been to reduce the number of commercial airline accidents.

Which of the following, if true, provides
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