The correct sentence is option C. It is “against who did you think you would compete in the contest?”
EXPLANATION:
The problem in that question is you are asked to choose the correct use of <em>“whom” </em>and <em>“who”.</em><em> “whom”</em> and <em>“who”</em> are relative pronouns that are used to substitute the subjects or the nouns in a sentence. The different is, <em>“whom”</em> is used to substitute the direct or indirect object of a verb or preposition, while <em>“who” </em>is used to substitute the subject in a sentence.
The example is the first option, A, she is the person whom he had found sleeping in the library. The correct relative pronoun used in this sentence is <em>“who”</em> instead of <em>“whom”</em> because it substitutes the subject in a sentence. Option B, the musical group who won the top prize are from my hometown, should use the relative pronoun <em>“who”</em> instead of <em>“whom”</em> because it substitutes the subject of a sentence.
The same with the option D, that author is the one who I saw at the bookstore today, in this sentence, the relative pronoun should be used in this sentence is <em>“whom” </em>instead of <em>“who”</em> because it substitutes the direct object of a verb or preposition.
LEARN MORE:
If you’re interested in learning more about this topic, we recommend you to also take a look at the following questions:
1. Which of the following is a run-on sentence? brainly.com/question/6394723
2. Which of the following is the clearest and most effective sentence? brainly.com/question/2863338
KEYWORDS: relative pronoun
Subject: English
Class: 10-12
Sub-chapter: Correct sentence