The error in this sentence occurs at (C), where there is an incorrect verb form. The plural verb "are" should be the singular "is" to agree with the singular gerund, "modifying eating and exercise habits."
In grammar, a gerund is a word that is derived from a verb that functions as a noun, in English, it mostly ends with -ing, which is mostly termed a past participle. The four types of gerunds are
Gerunds are always used after verbs like play, avoid dislike, etc. They are often used at the beginning of the sentence.
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