And you did all this against your doctor's orders!" "Which one." he asked, laughing.

Explanation

The word "one" itself is correct, but the punctuation following it is incorrect. The sentence should have a question mark after "Which one" to correctly punctuate the question.Correct Answer:The correct answer is C) One because the punctuation after "Which one" is incorrect.Explanation and Correction:To correct the punctuation error:Replace the period after "Which one" with a question mark.Corrected Sentence:"And you did all this against your doctor's orders!" "Which one?" he asked, laughing.This correction ensures the sentence is grammatically accurate by properly punctuating the question.