Asked by SANWIL SEQUEIRA · ST MARY'S CENTRAL SCHOOL, KINNIGOLI
Answer: C. Before speaking to the chief guest, Aarav was on his toes because he was nervous.
In A, B, and D, on one's toes means alert, active, and ready.
In C, the context suggests nervousness, but the idiom on one's toes does not mean nervous. Therefore, the idiom is misused in that sentence.
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