GMAT Sentence Correction (SC) | Re: Early ornithologists often mistook the calling of the

Early ornithologists often mistook the calling of the Mockingbird as the rare Rufous Sided Towhee

A. calling of the Mockingbird as the rare Rufous Sided Towhee
B. call of the Mockingbird for that of the rare Rufous Sided Towhee
C. call of the Mockingbird as the rare Rufous Sided Towhee
D. calling of the Mockingbird for that of the rare Rufous Sided Towhee
E. Mockingbird calling for the rare Rufous Sided Towhee

Although i reached the correct answer, still i would like to discuss it.
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