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Verbal·Standard English Conventions·Form, Structure, and Sense

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Archived within the storied libraries of Timbuktu, a West African city prominent during the Songhai Empire, is Straight Dosage and Sufficient Scent, one of the city’s hundreds of thousands of historical manuscripts, each of which        researchers insight into Timbuktu’s tenure as a center of trade and education.

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

A

offers

B

are offering

C

offering

D

offer