Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences given.Câu hỏi Sara's classmates said that she littered the school yard. She denied it. A. Sara denied having littered the school yard. B. Sara denied her friends' littering on the school yard. C. Having littered the school yard, Sara's classmates denied it. D. As Sara denied it, her classmates said that she littered the school yard.