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

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The Quadrantid meteor shower has a zenithal hourly rate (ZHR) of $110$, meaning that at the shower’s peak, $110$ meteors per hour could potentially be seen by a hypothetical observer. A calculation that assumes ideal viewing conditions,       

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

A

the number of meteors an actual viewer observes in an hour may differ.

B

there may be a considerable difference between the number of meteors an actual viewer observes in an hour and the ZHR.

C

an actual viewer’s observed number of meteors in an hour and the ZHR may differ considerably.

D

the ZHR may differ considerably from the number of meteors an actual viewer observes in an hour.