Choose the interpretation that is most appropriate for each sentence.
You will certainly break his heart if you tell him that. This means that telling him that would
The correct answer is: A
Explanation
This sentence implies that revealing whatever "that" refers to would have a significant emotional impact on the person being told. In this context, "break his heart" is a strong expression indicating deep sadness or emotional distress, so the most appropriate interpretation is that telling him that would make him very sad.