Question

Read the sentence.

Answer 1

I know that the answer is definitely not whoever. Whom is never the subject of a verb, therefore the answer is Who.

Answer 2

Whom did you like best in the movie?

Here whom is used as the object of the verb.

Deciding to use who or whom in a sentence or a question can be very tricky either as a relative pronoun or question word. An easy way to do it may be by substituting he or him. If HE sounds right, who is correct; if him sounds correct, whom is the most suitable option.

In this case the correct option is whom as it could not be replaced by a HE in the answer.

Whom did you like best in the movie?  I liked HIM.