D
A good way to get over one' s fear of an activity one finds terrifying is to do it repeatedly. For instance, over half of people who have parachuted only once report being extremely frightened by the experience, while less than 1 percent of those who have parachuted ten times or more report being frightened by it. The reasoning in the argument is most vulnerable to criticism on the grounds that the argument
A: neglects to consider those people who have parachuted more than once but fewer than ten times
B: takes for granted that the greater the number of dangerous activities one engages in the less one is frightened by any one of them
C: takes for granted that people do not know how frightening something is unless they have tried it
D: overlooks the possibility that most people who have parachuted many times did not find it frightening initially