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

easy

Water boils at around $212^{\circ }F$ at sea level, but in Questa, New Mexico (elevation: 7,461 feet above sea level), it boils at around $198^{\circ }F.$ Food writer J. Kenji López-Alt, who explores the science behind cooking, __________ that lower boiling points at higher elevations “can wreak all sorts of havoc on recipes.”

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

A

explains

B

are explaining

C

explain

D

have explained