The sentence talks about a movie that was captivating, meaning it held the audience's attention strongly.
Step 1: Check tense and meaning
- (A) "Can't stop'' is present tense, which doesn't fit with "was'' (past tense) in the first part of the sentence.
- (B) "Couldn't stop'' matches past tense and expresses that the audience was so captivated that they kept talking about the movie.
- (C) "Not stop'' is grammatically incorrect without an auxiliary verb.
- (D) "Should stop'' has a different meaning, suggesting the audience needs to stop talking, which doesn't fit the context.
Step 2: Choose the best option
Option (B) fits best because of tense agreement and meaning.
Conclusion
Correct answer is (B).