The striking differences between the semantic organization of Native American languages and __________________ led scholars to t
hink about the degree to which differences in language may be correlated with nonlinguistic differences. (A) that of European languages, in both grammar and vocabulary, have
(B) that of European languages, including grammar and vocabulary, has
(C) those of European languages, which include grammar and vocabulary, have
(D) those of European languages, in grammar as well as vocabulary, has
(E) those of European languages, both in grammar and vocabulary, has
The subject is plural differences; hence, we need 'have' as the verb. B, D and E don't follow this criteria. Between A and C, the relative pronoun which modifies European languages a) distorting the meaning and b) flouting touch rule. Therefore, A is the correct choice.
