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Sentence Correction: Parts of Speech - Articles

Indole-3-Carbinol is one of the healthy chemical components that is found in broccoli, and researchers believe that the chemical can substantially halt the growth of cancer cells.

This answer choice is grammatically incorrect. The relative clause that is found in broccoli describes the noun that appears immediately before it, namely, components. Since components is plural, the verb that follows it also needs to be plural. However, is is singular.

What helps us identify this question as a Relative Clause question as well as identify the mistake is the following Stop Sign:

one of the + plural noun + who/which/that

Whenever you see this Stop Sign, make sure that the following verb is plural.

Although this answer choice corrects the original  Relative Clause error by using the plural verb are, it uses an adjective (substantial) to describe a verb (halt). Only an adverb can be used to describe a verb.

Although this answer choice corrects the original  Relative Clause error by using the plural verb are, it commits a Parts of Speech error. A singular count noun must be preceded by an article. In this answer choice, however, the noun chemical is preceded by a relative pronoun (that).

Although this answer choice corrects the original  Relative Clause error by using the plural verb are, it creates Redundancy by using the wordy phrase have reason to believe.

You've got it!

This answer choice corrects the original  Relative Clause error by using the plural verb are.

is found in broccoli, and researchers believe that the chemical can substantially
are found in broccoli, and researchers believe that the chemical can substantially
are found in broccoli, and researchers believe that the chemical can substantial
are found in broccoli, and researchers have reason to believe that the chemical can substantially
are found in broccoli, and researchers believe that chemical can substantially