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Archive·Standard English Conventions·Boundaries

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Scientists have long known that cyclones can contribute to the formation of polynyas, large patches of unfrozen water that sporadically form amid vast sheets of sea ice. A recent study found evidence that these polynyas may be __________ but also by vapor streams, which travel through the atmosphere from the tropics toward the North and South Poles.

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

A

caused not only by cyclones—

B

caused—not only by cyclones—

C

caused, not only by cyclones,

D

caused not only by cyclones