Concept:When we agree with a negative statement, we use a negative answer.
Explanation:If someone says something like "It wasn't a good movie, was it?", they expect agreement.
To agree, we respond: "No, it wasn't."
This means "No, it was not good."
Choosing "Yes, it wasn't" would be contradictory.
Therefore, the correct option is the one that keeps both the helping verb and the meaning negative.
Answer:B. No, it wasn't