[求助]XDF小蓝section-10-15

Almost like clones in their similarity to one another, (the cheetah species’ homogeneity makes them especially vulnerable to disease).
A the cheetah species’ homogeneity makes them especially vulnerable to disease
B the cheetah species is especially vulnerable to disease because of its homogeneity
C the homogeneity of the cheetah species makes it especially vulnerable to disease
D homogeneity makes members of the cheetah species especially vulnerable to disease
E members of the cheetah species are especially vulnerable to disease because of their homogeneity

答案是E,怎么解释啊？盼指点。