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Verbal·Standard English Conventions·Boundaries

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Proto-Atlantic-Congo—a protolanguage, or ancestral language of a family of descendant (daughter) languages—is said to be the common ancestor of all Atlantic-Congo languages. This designation is        Proto-Atlantic-Congo is only postulated, its characteristics being inferred from the linguistic properties of its 1,453 daughters.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

hypothetical, however,

B

hypothetical: however,

C

hypothetical, however;

D

hypothetical. However,