Jockeys at most racetracks become familiar with the horses by riding t

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Here is a detailed explanation to this question-


Choice A: In Option A, we see a clear subject-verb disagreement between the verb "keeps" and the pronoun "which" as the pronoun refers to the plural noun "workouts". Thus, Option A is incorrect.

Choice B: Option B suffers from the same error that option A does. Moreover, this answer choice alters the meaning of the sentence; the intended meaning of the sentence is that the jockeys become familiar with the horses by riding them in early morning workouts, but this answer choice implies that the process of becoming familiar and riding the horses are two separate things through the phrase “and also ride them”. Thus, Option B is incorrect.

Choice C: Option C maintains subject-verb agreement throughout the sentence and conveys the intended meaning. Thus, Option C is correct.

Choice D: Option D suffers from the same error that option A does. Thus, Option D is incorrect.

Choice E: Option E suffers from the same meaning-related error that Option B does. Thus, Option E is incorrect.

Hence, C is the best answer choice.

To understand the concept of “Which, Who, Whose, and Where on GMAT”, you may want to watch the following video (~1 minute):



All the best!
Experts' Global Team

Where is the required comma before which? Are there any exceptions?

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"which" is a pronoun , it cannot refer to an action (jockeys "become familiar" with horses by riding them),
Hence option C is correct which has "a practice" which acts as noun + noun modifier