单选题 The facts show that the fear of flying in airplanes is not rational. In 1986 alone, there were 46,000 fatalities in highway accidents, but from 1980 to the present an average of only 77 per year in accidents on major domestic airlines. The rate for regional airlines was only slightly higher.
If the evidence cited above is accurate, which of the following would be most important to know in order to evaluate the force of that evidence?

A、 Whether repeated airplane travel allays fear of flying in airplanes.
B、 Whether regional and domestic airlines spend the same average amount of time per aircraft on maintenance.
C、 How many people reported a fear of flying in airplanes that was strong enough to prevent them from traveling by air.
D、 How many people per year have traveled by highway and how many by air since 1980.
E、 (E) How much higher the accident rate has been for regional airlines than for major domestic airlines since 1980.

【正确答案】 D

【答案解析】