题目内容：
Which of the statements is NOT true according to the second paragraph?
A．Crashes of general aviation aircraft are a major source of aviation accidents in the United States. B．Male pilots, like male vehicle drivers, are a more likely to have accidents than female pilots.
C．It is commonly known that aircraft crashes are mostly caused by young and inexperienced pilots.
D．Only mature pilots are studied to determine the gender differences in the reasons for aircraft crash.
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答案解析：