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A consistent rise in emissions of carbon dioxide over the past two centuries suggest that the industrial revolution, which was driven by energy derived from fossil fuels, is a chief cause of global warming.
This answer choice is grammatically incorrect, because the plural verb suggest does not agree with the singular subject rise.[[snippet]]
This answer choice does not fit into the sentence for two reasons:
(1) Changing the conjugated verb suggest to the V+ing form suggesting creates a fragment. The subject rise needs a conjugated verb and the V+ing form is NOT a conjugated form.
(2) In the corrected sentence a single comma separates between the subject the industrial revolution and the verb is.
Remember: A single comma must never separate between a sentence's subject and main verb:
Correct: The earth revolves around the sun. (no comma)
Correct: The earth, as part of the solar system, revolves around the sun. (Two commas)
Incorrect: The earth, revolves around the sun (single comma).
Although this answer choice corrects the original Subject Verb Agreement mistake, by changing the plural verb suggest to the singular verb suggests, it creates another grammatical mistake by removing the comma before the word which.
Stop Sign: Who, which, that, whose, whom:
Whenever we see one of the relative pronouns in a Sentence Correction question, we need to check whether the use of the relative clause in the sentence is correct. The relative pronoun which is used only in non-defining clauses, which are separated from the rest of the sentence by commas.
Although this answer choice corrects the original Subject Verb Agreement mistake by replacing the plural verb suggest to the singular verb is, it changes the meaning of the sentence, and also makes it illogical.
It is illogical to say that a rise in emissions is a suggestion. On the other hand, a rise in emissions can suggest, or in other words, indicate something.
This answer choice corrects the original Subject Verb Agreement mistake by changing the plural verb suggest to the singular verb suggests.[[snippet]]