At a movie the ater box office, all tickets are pre-numbered. At the end of each day, the beginning ticket number is subtracted from the ending number to give the number of tickets sold. Cash is counted and compared with the number of tickets sold. Which of the following situations does this control detect?
A. Some customers presented tickets purchased on a previous day when there wasn't a ticket taker at the theater entrance.
B. A group of kids snuck into the the ater through a back door when customers left after a show.
C. The box office cashier accidentally gives too much change to a customer.
D. The ticket taker admits his friends without tickets.