1. The average age and racing experience of the drivers at the Indianapolis 500 automobile race increased each year between 1965 and 1980. The reason for the increase is that high-speed racing drivers were living longer than their predecessors. Race-car safety features that reduced the severity of crashes of the kind that formerly took drivers' lives were primarily responsible for the increase in the average age of the Indianapolis 500 competitor. Which of the following, if true, would be most likely to be part of the evidence used to show that safety features on the cars that protected dribers in major crashes were responsible for the increase in the average age of drivers at the Indianapolis race? (A) Younger drivers at high-speed racetracks were involves in major accidents at a slightly higher rate than were older drivers between 1965 and 1980.
(B) Major accidents on high-speed racetracks occurred at about the same frequency in the years after 1965 as in the years before 1965.
(C) The average age of drivers attempting to qualify for the Indianapolis 500 decreased slightly between 1965 and 1980.
(D) Accidents on highways in the United States occurred at about the same frequency in the years after 1965 and 1980.
(E) Other safety features, involving the condition of the racetrack and the uniforms worn by the drivers while driving, were adopted at Indianapolis between 1965 nd 1980. 选B吗? | 
