10. Young female ballet dancers and gymnasts sometimes fail to maintain good eating habits caused by the desire to be as thin as possible.

(A) Young female ballet dancers and gymnasts sometimes fail to maintain good eating habits caused by the desire to be as thin as possible.

(B) Good eating habits sometimes fail to be maintained by young female ballet dancers and gymnasts caused by desiring to be as thin as possible.

(C) Because they desire to be as thin as possible, good eating habits are sometimes not maintained by young female ballet dancers and gymnasts.

(D) Because they desire to be as thin as possible, young female ballet dancers and gymnasts sometimes fail to maintain good eating habits.（D）

(E) Young female ballet dancers and gymnasts sometimes fail to maintain good eating habits because they desire to be as thin as possible.

这题D、E答案有什么区别吗？是不是在E中，they的指代会有问题，gymnasts or ballet dancers and gymnasts，所以错。请NN指教！