GMAT Sentence Correction (SC) | Re: In an exhaustive study that explains how humans distinguish

In an exhaustive study that explains how humans distinguish different scents, Dr. Linda Quidd asserts that the nerve lining of a mouse's nose contains roughly the same number of olfactory receptors that a human nose does.

A. that a human nose does
B. that human noses do
C. as that of a human's nose
D. as those of a human
E. as human noses do