Gathering accurate data on water flow in the United States is challenging because of the country’s millions of miles of ______blank the volume and speed of water at any given location can vary drastically over time.
Which choice completes the text so that it conforms to the conventions of Standard English?
Correct answer: D
Explanation
Choice D is the best answer. The convention being tested is punctuation within two coordinated noun phrases. When, as in this case, a noun phrase (“the country’s millions of miles of waterways”) is coordinated with another noun phrase (“the fact”) followed by an integrated relative clause (“that the volume...time”), no punctuation is needed.
Choice A is incorrect because no punctuation is needed. Choice B is incorrect because no punctuation is needed. Choice C is incorrect because no punctuation is needed.
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