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 hada vocal tract that resembledthose of the apes --> comparison between singular vs plural
B. Neanderthals had a vocal tract resembling an ape's -->correct
C. The vocal tracts of Neanderthals resembled an ape's --> meaning issue "the vocal tracts .... & sowere w/o language "
D.
...
A. Neanderthals hada vocal tract that resembledthose of the apes --> comparison between singular vs plural
B. Neanderthals had a vocal tract resembling an ape's -->correct
C. The vocal tracts of Neanderthals resembled an ape's --> meaning issue "the vocal tracts .... & sowere w/o language "
D.
...
