The statement which contrasts two items is: C. A whirlpool is powered with water, but a black hole is powered by gravity.
What is a contrast?
A contrast can be defined as a rhetorical (literary) device through which a writer identifies and emphasizes the differences between two items, people, place, subject or ideas.
In this context, a statement which contrasts two items is the one that identifies the difference between a whirlpool and a black hole.
In conclusion, a contrast would state that a whirlpool is powered with water while a black hole is powered by gravity.
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