Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.

Why do most students buy meal contracts

A．They are free to have their meals any time for their convenience in the dorm kitchens.
B．They have more choices of eating at any cafeterias rather than being limited in the small dorm kitchens.
C．They can eat in Darney dining-hall during the vacation time.
D．They can eat as much food as they want with the meal contracts.