He has broken new ground in cancer treatment with his drug, This means that he has

Step 1: Analyze the question The sentence uses an idiom: "to break new ground". You are asked to pick the meaning that best fits it in the context of cancer treatment.

Step 2: Explain the concept "To break new ground" means to do something new and original, to make a fresh discovery, or to pioneer a new approach in a field. The image comes from farming and building, where breaking ground means digging land that has never been worked before.

Step 3: Examine each option

• A. been highly acclaimed: This is about praise. The idiom may lead to praise, but it does not mean it.
• B. introduced a new method in cancer treatment: This matches the idiom. He pioneered something new in the field.
• C. solved all cancer problems: This is an exaggeration. Breaking new ground means making progress, not solving everything.
• D. thought of a new drug for cancer treatment: This is close, but the idiom is broader than just thinking of a drug. It means a new approach was actually introduced, not merely conceived. His drug is also already mentioned in the sentence, so "a new drug" adds nothing.

Step 4: Answer The most appropriate interpretation is B. introduced a new method in cancer treatment.

Tip: For idiom questions, find the core meaning of the phrase first, then reject options that are too extreme (such as "solved all") or that describe only a result (such as "acclaimed"). Related idioms to learn: "break the ice" (start a conversation), "blaze a trail" (be a pioneer).