You will certainly break his heart if you tell him that. This means that telling him that would

Step 1: Analyze the question The sentence uses an idiom: "break his heart." We must pick the option that best captures its meaning.

Step 2: Explain the concept "To break someone's heart" means to cause them intense emotional pain or grief. It is stronger than ordinary disappointment. It is usually linked to deep sadness, such as through loss, betrayal, or very bad news.

Step 3: Evaluate the options

• A. make him very sad: This matches the idiom. Heartbreak means deep sorrow.
• B. meet his expectations: This is the opposite of upsetting him, so it is wrong.
• C. greatly disappoint him: This is close, because heartbreak can involve disappointment. But disappointment is about unmet hopes, while "break his heart" stresses emotional pain and sadness. It is a plausible distractor but less precise.
• D. make him confirm his suspicion: This has nothing to do with the idiom.

Step 4: Decide between A and C The idiom's core meaning is deep sadness or grief, so A is the closest interpretation.

Answer: A. make him very sad

Tip: In idiom questions, choose the option that matches the emotion in the idiom. "Heartbreak" points to sadness or grief. Be careful with near-synonyms like "disappoint," which describe a different feeling. Also, always eliminate options that mean the opposite (like B) or that are unrelated (like D) first.