an test question

[yulysess]

Hello everyone

The gap between language_____ spoken and understood by humans and _____generated and understood by other animals is considerable.


A) as/that B)which is/which C) as it is/what D) where it is/that is

Which and why?

Thanks in advance

[Casiopea]

My choice is A).

The gap between language as spoken and understood by humans and that generated and understood by other animals is considerable.

A) as/that B)which is/which C) as it is/what D) where it is/that is

Consider,

The gap between language
as (it is) spoken and understood by humans
and
as (it is) or that generated and understood by other animals
is considerable.