CXD逻辑18,N哥请进!

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 one of the following points out why the trustees' plan might not be effective in achieving its goal?
(a) the best actors can also apply for admission to another program and then not enroll in the avonbridge program
(b) audition materials that produce good results for one actor may disadvantage another, resulting in inaccurate assessment
(c) the top 10 percent of local and nonlocal applicants might not need scholarships to the avonbridge program
(d) some of the applicants who are offered scholarships could have less highly evaluated auditions than some of the applicants who are not offered scholarships
(e) dividing applicants into local and nonlocal groups is unfair because it favors nonlocal applicants
我选b，对同一个材料有些演员可能善长，有些演员可能不善长,所以会影响评价的精确性.
但正确答案不是b,牛哥们我稍后给出正确答案