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, ______ an important concept in
modern chemistry.
have remained
remain
remains
are remaining
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."