The proncipal raised eyebrows at the student's explanation. This means that the principal

Analyze the question: This tests your knowledge of idioms. The idiom is "raised eyebrows" (or "raise an eyebrow"), and you must pick the option that best matches its meaning.

Explain the concept: To "raise eyebrows" at something means to react with surprise, doubt, or mild disapproval. The core idea is surprise, often because something is unexpected or unusual. It does not necessarily mean the person is angry, has rejected something, or is thinking it over.

Step-by-step solution:

• A. was unhappy about the explanation. Raised eyebrows can hint at disapproval, but being unhappy is a stronger and different feeling. The idiom does not mean unhappiness.
• B. rejected the explanation. The idiom describes a reaction, not a decision. The principal may not have rejected anything.
• C. considered the explanation. This suggests careful thought, which is not what the idiom means.
• D. was surprised by the explanation. This matches the core meaning of the idiom: a surprised or startled reaction.

Answer: D

Tip: For idiom questions, picture the physical action. Raised eyebrows are what your face does when you are surprised. Similar idioms to remember: "turn a blind eye" (ignore on purpose) and "pull someone's leg" (joke with them). Always choose the option closest to the core meaning, not the strongest emotion.