The box-and-whisker plots below represent the scores for pre- and post-written tests for applicants obtaining their driver's licenses. A passing score is 70%. A : exactly 25% more applicants passed the post-test than the pre-test
B : exactly 50% more applicants scored below the passing score on the pre-test than on the post test
C : of all the applicants that passed the pre-test, only 25% scored higher than a 90
D : of all the applicants that passed the post-test, only 50% scored between a 70 and an 80