Select the most appropriate option to fill in the blank.

I have nobody ______ I can confide in.

whom

The most appropriate option to fill in the blank is whom.

The sentence is about the speaker not having anyone to confide in. The word "whom" is the object form of the pronoun "who" and is used to refer to a person who is the object of a verb or preposition. In this context, the speaker is saying that they have nobody who they can confide in.

The other options are not as appropriate.

• Whose is the possessive form of the pronoun "who" and is used to show ownership. This does not make sense in the context of the sentence because the speaker is not saying that they have nobody's trust.
• Which is a relative pronoun that is used to refer to a thing. This does not make sense in the context of the sentence because the speaker is not saying that they have nobody that they can talk to.
• Whoever is an indefinite pronoun that is used to refer to any person. This is a possible option, but it is not as specific as "whom". "Whom" specifically refers to a person who the speaker can confide in.