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Verbal·Standard English Conventions·Form, Structure, and Sense
hard
The Southern Delta Aquariid meteor shower has a zenithal hourly rate (ZHR) of 25, meaning that at the shower’s peak, 25 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
an actual viewer’s observed number of meteors in an hour and the ZHR may differ considerably.
B
the number of meteors an actual viewer observes in an hour may differ considerably from the ZHR.
C
there may be a considerable difference between the number of meteors an actual viewer observes in an hour and the ZHR.
D
the ZHR may differ considerably from the number of meteors an actual viewer observes in an hour.