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Verbal·Standard English Conventions·Boundaries

hard

Astronomers Annie and Edward Maunder meticulously studied historical records of dark areas on the sun’s surface known as sunspots. Their work in the late 1800s led to the identification of a period from 1645 to 1715—now known as the Maunder __________ sunspots were notably scarce, a phenomenon that solar physicists continue to investigate.

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

A

Minimum when

B

Minimum—when

C

Minimum, when

D

Minimum: when