Motorcycle-safety courses, offered by a number of organizations, teach motorcyclists important techniques for handling their vehicles and for safely sharing the road with other road users. If more motorcyclists took these courses, there would be fewer serious motorcycle accidents. Data show that 92 percent of the motorcyclists who are involved in a serious motorcycle accident have never taken a motorcycle-safety course.
In assessing whether the data cited provide support for the position taken about more motorcyclists’ taking the courses, it would be most useful to determine which of the following?
Whether significantly more than eight percent of motorcyclists have taken a motorcycle-safety course
Whether it is riskier for a motorcyclist to ride with a passenger behind the rider than to ride alone
Whether the different organizations that offer motorcycle-safety courses differ in the content of the courses that they offer
Whether more than 92 percent of serious motorcycle accidents involve collisions between a motorcycle and another vehicle in motion
Whether variations in the size and potential speed of a motorcycle influence the risk of a serious accident’s occurring
Motorcycle-safety courses, offered by a number of organizations, teach motorcyclists important techniques for handling their vehicles and for safely sharing the road with other road users. If more motorcyclists took these courses, there would be fewer serious motorcycle accidents. Data show that 92 percent of the motorcyclists who are involved in a serious motorcycle accident have never taken a motorcycle-safety course.
In assessing whether the data cited provide support for the position taken about more motorcyclists’ taking the courses, it would be most useful to determine which of the following?
A. Whether significantly more than eight percent of motorcyclists have taken a motorcycle-safety course 是否超过8%的人参加了这个课程，如果8%的人没上过课，那就是大家都没有上过，无法得出结论句的因果关系
B. Whether it is riskier for a motorcyclist to ride with a passenger behind the rider than to ride alone 单独骑车vs载人，无关
C. Whether the different organizations that offer motorcycle-safety courses differ in the content of the courses that they offer 不同组织提供的不同课程，无关
D. Whether more than 92 percent of serious motorcycle accidents involve collisions between a motorcycle and another vehicle in motion 是否超过92%严重事故都是因为摩托车和其他vehicle的撞击，我自己误选了这个，本以为是呼应了第一句里"teach motorcyclists important techniques for handling their vehicles and for safely sharing the road with other road users"，但根据结论句，应该关注点是参不参加课程，而不是课程里面更细的内容，自己想复杂了。
E. Whether variations in the size and potential speed of a motorcycle influence the risk of a serious accident’s occurring 尺寸和速度，无关