Bonnie is the person whom is most likely to win. Did you see whom accepted the award?
Explanation:
When in doubt, try this simple trick: If you can replace the word with “he”' or “'she,” use who. If you can replace it with “him” or “her,” use whom. Who should be used to refer to the subject of a sentence. Whom should be used to refer to the object of a verb or preposition.
The only correct sentence in which the pronoun <em>whom </em>is used correctly is the last one: To whom was the award given? 1. should be - did you see who accepted... 2. should be - who do you... 3. should be - Bonnie is the person who is...