Which pronoun agrees with the antecedent in the sentence? Most of the film wasn't as exciting as __________ beginning. A. its B. theirs C. their D. it's
The sentence should read: Most of the film wasn't as exciting as its beginning.
Use the singular "its" to match the singular antecedent "the film". You wouldn't use their or theirs because they are plural and the antecedent is singular, and you wouldn't use it's because it is a contraction that means it is.