Select the most appropriate option to fill in the blank.
I have nobody ______ I can confide in.

Correct option is D

The correct option to fill in the blank in the sentence "I have nobody ______ I can confide in." is (d) "whom."

• Explanation: In this sentence, "whom" is used as the object of the preposition "in." The sentence structure requires an object pronoun, and "whom" is the appropriate choice as it refers to a person in the objective case. The preposition "in" is typically paired with "whom" in formal English when referring to the person someone confides in.
• Corrected Sentence: "I have nobody whom I can confide in."

The use of "whom" correctly aligns with formal grammatical rules, making it the best fit among the options provided.