Answer:
The correct pronoun is whomever.
Step-by-step explanation:
The pronoun whomever is the objective case of whoever. This means whomever can only be used either with a preposition (e.g. to, for, or about) or with a verb (an action word) that requires a direct object. Use whoever or whomever to agree with the verb in that dependent clause, regardless of the rest of the sentence.