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Standard English Conventions / Form, Structure, and Sense Difficulty: Medium

Solarpunk is an art movement that imagines renewable energy–powered technology infused complementarily into nature. In Paolo Bacigalupi’s solarpunk short story “Efficiency,” an artificial intelligence that absorbs sustainable energies, redistributing them through intricate networks of weights and generators, blank Chicago’s energy grid.

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

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Explanation

Choice C is the best answer. The convention being tested is subject-verb agreement. The singular verb "powers" agrees in number with the singular subject "an artificial intelligence."

Choice A is incorrect because the plural verb "have been powering" doesn’t agree in number with the singular subject "an artificial intelligence." Choice B is incorrect because the plural verb "power" doesn’t agree in number with the singular subject "an artificial intelligence." Choice D is incorrect because the plural verb "are powering" doesn’t agree in number with the singular subject "an artificial intelligence."