求助：GWD21-Q39: 指代问题，请教NN们，拜谢！
39. GWD21-Q39:
Almostlike clones in their similarity to one another, the cheetah species’homogeneity makes them especially vulnerable to disease.
A. the cheetah species’ homogeneity makes themespecially vulnerable to disease
B. the cheetah species is especially vulnerableto disease because of its homogeneity
C. the homogeneity of the cheetah species makesit especially vulnerable to disease
D. homogeneity makes members of the cheetahspecies especially vulnerable to disease
E. members of the cheetah species areespecially vulnerable to disease because of their homogeneity
参考答案是E。Okey，我错选了B。
这个题目我就在B和E之间纠结。一方面我觉得clones对应的members一定是更加合理的。B的逻辑上cheetah species 的 homogeneity似乎不合适。
可是另外一个方面，E中间出现了两个their。第一应该指代的是clones，第二个应该指代的是members of the cheetah。根据一个句子里面一个代词不能指代两个不同的对象，E应该是错的。
请NN们指点一下，E中的their是否可以这样使用？
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