Which word in the sentence is the direct object?

I saw the new action movie last night at the theater.

a. action

b. movie

c. saw

d. I

The answer is B, movie. "Action" is used as an adjective here, so it cannot be an object when there is no noun present. "Saw" is a verb. "I" is the subject, so the only remaining option is B, movie. The question to easily determine what the object is would be "What did you see?" And the answer would be "A movie".