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1.        Neanderthals had a vocal tract that resembled those of the apes and so were probably without language, a shortcoming that may explain why they were supplanted by our own species.

(A) Neanderthals had a vocal tract that resembled those of the apes

(B) Neanderthals had a vocal tract resembling an ape’s

(C) The vocal tracts of Neanderthals resembled an ape’s

(D) The Neanderthal’s vocal tracts resembled the apes’（B）

(E) The vocal tracts of the Neanderthals resembled those of the apes

这题前面有讨论，可还是没搞清楚。B中Neanderthals是复数，怎么可以和a vocal tract(单数)对应呢？

该题我还有疑问:

Neanderthals怎么和单数的an ape对应