Answer:
b) Whom do you think the candidate will choose for her running mate?
(it should be who)
Step-by-step explanation:
The difference between who and whom is the same as the difference between I and me, he and him, she and her, and they and them.
Who is a subject pronoun like I, whom is an object pronoun like me.
Lets dig deeper.
We have "who". It's a subject pronoun. It refers to the person who is doing the action, the subject.
Example:
Who is coming to the party? Who lives here?
If you want to check if you're using who correctly in these sorts of sentences, try answering the question with another subject pronoun.
Who is coming to the party? She is coming to the party. You wouldn't say, her is coming to the party.
Who lives here? They live here. You wouldn't say, them live here.
We also use who in indirect questions along with the direct questions that we saw just now.
Do you know who is coming with us? Could you tell me who that woman is?
We also use who in relative clauses. These are clauses that tell us more about a person or a thing.
My sister, who lives in New York, is a doctor.
In relative clauses, we use relative pronouns to refer to the person or the thing and in relative clauses, who is the relative pronoun, who is a relative pronoun that we use to refer to the subject of the clause.
To check if you're using this relative clause correctly, you can remove it and see if the sentence still makes sense.
My sister is a doctor.
You can also isolate the who clause and insert she.
She lives in New York. Another example. She's the teacher who told me I would fail maths!
We can replace who with she, and isolate it. She told me I would fail maths!
And finally, who is used in reported speech.
She told me who was coming.
They asked, who was arriving first.
And now whom. As we said, it's an object pronoun. It receives the action of the sentence. Let's take a look at a sentence with an object pronoun.
She went to the park with him. Him, is the object pronoun. Now, if you wanted to know who her companion was, you could say, whom did she go to the park with?
Another example, whom would you prefer to have as manager?
How can you check if this is correct?
By answering the question with another object pronoun.
I would prefer to have her as a manager.
Whom? Her.
You can't say I'd prefer to have she as a manager, it's her. So we use whom.
Another thing about whom is that we should always use it with a preposition, for example, whom did you give that present to or to whom did you give that present?
Whom are you cooking dinner for? Or for whom are you cooking dinner?
The second version of those questions with the preposition at the beginning is technically more grammatically correct.
We can also use whom in relative clauses when we are referring to the object of the clause.
Julio, whom we met on the plane, is Spanish. Whom is the object of met, we met Julio, or we met him.
If the relative clause includes a preposition, we use whom.
Tanya is the woman from whom I received a letter.
Let's take a look at a few more examples of who and whom.
Who made this delicious cake? He made this delicious cake.
Whom are you going to Greece with? Or with whom are you going to Greece?
I'm going to Greece with him.
She has a daughter who is a pilot.
Her daughter, to whom she is very close, is a pilot.