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Standard English Conventions Difficulty: Easy

In 1899, Swedish chemist Svante Arrhenius developed an equation to answer a long-standing question: why do chemical reactions speed up at higher temperatures? The Arrhenius equation, named for its creator, blank an important concept in modern chemistry.

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. This choice uses the singular verb "remains" to match the singular subject "equation."

Choice A is incorrect. The singular noun "equation" doesn’t match with the plural verb conjugation "have remained." Choice B is incorrect. The singular noun "equation" doesn’t match with the plural verb conjugation "remain." Choice D is incorrect. The singular noun "equation" doesn’t match with the plural verb conjugation "are remaining."