Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning to each of the following questions.

"Which cities have the worst waste problem?" the student asked the teacher.

A.The student asked the teacher for which cities had the worst waste problem.

B.The student asked the teacher to tell him which cities had the worst waste problem.

C.The student asked the teacher which cities had the worst waste problem.

D.The student asked the teacher which cities had had the worst waste problem.