请教一CR题

deadbeat56

    The  trustees of the Avonbridge summer drama workshop have decided to offer scholarships to the top 10 percent of local applicants and the top 10 percent of nonlocal applicants as judged on the basis of a qualifying audition.They are doing this to ensure that only the applicants with the most highly evaluated auditions are offered scholarships to the program.

    Which of the following points out why the trustees' plan might not be effective in achieving its goal?

   其他的答案都好排除 但是正确选项我却不理解是怎样成为explanation的？

   Some of the applicants who are offered scholarships should have less highly evaluated auditions than some of the applicants who are not offered scholarships.

   请哪位高手指点一下。多谢。