PREP一道题,请帮忙解答

The Sports Medicine Programs of the Olympic Training Center, a complex where final tryouts are

held for athletes representing the United States in the Olympics, is geared toward enhancing

athletes' performance and toward their preparation for international competition.

(A) is geared toward enhancing athletes' performance and toward their preparation

(B) is geared to enhance the performance of athletes and to prepare them

(C) are geared to enhance athletes' performance and their preparation

(D) are geared toward the enhancement of athletes' performance and toward preparing them

(E) are geared toward enhancing the performance of athletes and preparing them 

答案是E，我觉得应该选B，a complex已经说明主语是单数了，对吗

首先AB错，因为The Sports Medicine Programs是复数

C里面的Their 有可能指运动员 也有可能指Programs，不明确

D太烦琐

E正确 Toward + 动名词，但是我觉得E后面说的也有点拙劣。。