问一道比较简单的题，it指代问题，OG17-762

762. The eyes of the elephant seal adapt to darkness more quickly than any other animal yet tested, thus allowing it to hunt efficiently under the gloomy conditions at its feeding depth of between 300 and 700 meters.

A. The eyes of the elephant seal adapt to darkness more quickly than any other animal yet tested, thus allowing it

B. The eyes of the elephant seal adapt to darkness more quickly than does any other animal yet tested, allowing them

C. The eyes of the elephant seal adapt to darkness more quickly than do those of any other animal yet tested, allowing it

D. Because they adapt to darkness more quickly than any other animal yet tested, the eyes of the elephant seal allow it

E. Because the eyes of the elephant seal adapt to darkness more quickly than do those of any other animal yet tested, it allows them

题很简单，答案是C。

我第一遍做OG的时候没发现问题，直到我把所有OG，prep0708都学一遍后，用已经所学的再二刷OG的时候，觉得C的allowing it看着就奇怪起来了，这里的it为什么就可以指代the elephant seal了呢？按照it指代主句里主语的原则，it应该是指代the eyes的，但是eyes是复数，要么把it变成them，但是整句话逻辑就不对了。所以it就能在不产生歧义的情况下去指代不是主语的名词the elephant seal了？是这个逻辑么？