Read the sentence.

did you like best in the movie?

choose the form of the pronoun that correctly completes this sentence.

whom
whoever
who

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.

c hydrophobia is the answer

pulling in the reader is important