请教一题语法题GWD21-39

Almost like clones in their similarity to one another, the cheetah species’ homogeneity makes them especially vulnerable to disease.

1. the cheetah species’ homogeneity makes them especially vulnerable to disease
2. the cheetah species is especially vulnerable to disease because of its homogeneity
3. the homogeneity of the cheetah species makes it especially vulnerable to disease
4. homogeneity makes members of the cheetah species especially vulnerable to disease
5. members of the cheetah species are especially vulnerable to disease because of their homogeneity

麻烦大大帮我解释一下Eㄉ答案...thx~~

1.like A,B 能和clones并列的只有B,E了.

2.B里面的SPECIES是单数.而多者之间才会有相似性,所有只有E了.

中文:就象克隆复制品彼此的相似性一样, 猎豹物种的成员们特别易受疾病的攻击因为他们生理结构的相似性.

感谢大大ㄉ解答