Which option was used to revise this sentence? I studied hard and did well on the exam. Because I studied hard, I did well on the exam. A. reversed the order of subject and verb B. changed to a question, exclamation, or command C. added introductory words or phrases D. moved parts of the sentence around

C). Added introductory words or phrases.

Explanation:

Introductory words or phrases are described as the adverbs or interjections that are primarily employed to introduce a sentence in order to establish connectivity between the ideas and ensure a smooth transition.

In the given sentence, 'introductory words or phrases' have been added to revise the sentence. The introductory word 'because' functions to link the two ideas (I studied hard and I did well on the exam') together in a cause-and-effect structure. It converts the first clause ('I studied hard') into a 'dependent clause' ('Because I studied hard') that is setting the stage for main clause to ensure a smooth transition between ideas and enhance its efficacy. Therefore, option C is the correct answer.