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?
Correct answer: C
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."
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