First thing to note is Neandethals
is a common subject of compound statement separated by and
A. those is plural which is referring to singular antecedent vocal tract
B. Subject Neandethals
remains common to both part of compound statement. OA
C, D, and E has vocal tracts
as subject of 2nd part of compound statement (i.e and so were probably without language) which is incorrect.
Also, C, D and E uses plural vocal tracts
when singular is needed.
My dad once said to me: Son, nothing succeeds like success.