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Verbal·Standard English Conventions·Boundaries

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The Kaiparowits Formation is a fossil-rich layer of sedimentary rock in the Grand Staircase, a colossal sequence of rock layers stretching from Utah’s Bryce Canyon to Arizona’s Grand Canyon. The sandstones and mudstones of the Kaiparowits Formation were deposited        the Late Cretaceous, preserving many species from that time.

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

A

during;

B

during,

C

during

D

during: