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

The radiation that blank during the decay of radioactive atomic nuclei is known as gamma radiation.

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

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Explanation

Choice A is the best answer. The convention being tested is subject-verb agreement. The singular verb "occurs" agrees in number with the singular subject "radiation."

Choice B is incorrect because the plural verb "have occurred" doesn’t agree in number with the singular subject "radiation." Choice C is incorrect because the plural verb "occur" doesn’t agree in number with the singular subject "radiation." Choice D is incorrect because the plural verb "are occurring" doesn’t agree in number with the singular subject "radiation."