Motorcycle-safety courses, offered by a number of organizations, teach motorcyclists important techniques for handling 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% of the motorcyclists who are involved in a serious motorcycle accident have never taken a motorcycle-safety course. in assessing whether the data cited provided support for the position taken about 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 b. whether it is riskier for a motorcyclist to ride with a passenger behind the rider than to ride alone c. whether the different organizations that offer motorcycle-safety courses differ in the content of the courses that they offer d. whether more than 92% of serious motorcycle accidents involve collisions between a motorcycle and another vehicle in motion. e. whether variations in the size and potential speed of a motorcycle influence the risk of a serious accident's occuring.