题目选项分析

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?

【选项】Joggers are most susceptible to sports injuries during the first six months in which they jog.