Question ID:PT87 S3 Q13 Passage:A study tested the performance of 70 pilots, half of whom chose to go on a reduced-calorie diet. Those who did not diet performed well, while pilots who were dieting performed worse, although they had performed well before they started their diets. The average level of impairment for the dieters was approximately equal to that caused by consuming two alcoholic drinks on an empty stomach. Stem:Each of the following, if true, contributes to an explanation of the study results described above EXCEPT: Correct Answer Choice:DChoice A:Dieters often become preoccupied with worries about their weight losses and calorie intakes. Choice B:Many of the pilots, including both dieters and nondieters, consumed alcohol before the tests, and dieting increases vulnerability to alcohol's effects. Choice C:Reduced-calorie dieting makes most people more vulnerable to irritability and fatigue. Choice D:Many of the pilots chose to go on the diet because they were curious about whether one's weight affects one's piloting skills. Choice E:Whereas alcohol has no effect on the level of glucose (a nutrient vital to brain function) in the bloodstream, dieting lowers the glucose level.