Most consumers do not get much use out of the sports equipment they purchase. For example, 17 percent of the adults in the United States own jogging shoes, but only 45 percent of the owners jog more than once a yea, and only 17 percent jog more than once a week.

Which of the following, if true, casts the most doubt on the claim that most consumers get little use out of the sports equipment they purchase?

• AJoggers are most susceptible to sports injuries during the first six months in which they jog.  
• BIn surveys designed to elicit such information, joggers often exaggerate the frequency with which they jog.  
• CMany consumers purchase jogging shoes for use in activities other than jogging.  
• DConsumers who take up jogging often purchase athletic shoes that can be used in other sports.  
• EJoggers who jog more than once a week are often active participants in other sports as well.