According to reports on climate change, the survival of polar bears depends on several environmental _________ such as ice coverage and seal populations.
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writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
condition
B
factor
C
element
D
variables
Correct Answer: D
Choice D is the best answer. The list of examples ("ice coverage and seal populations") suggests multiple factors, so the plural "variables" is correct.
Choice A is incorrect because "condition" is singular. Choice B is incorrect because "factor" is singular. Choice C is incorrect because "element" is singular.