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. According to the passage, if all students attend year-round schools in U.S. they would
A．have a 3-month long summer holiday. B．have the same arrangement for schooling. C．go to school at a differently organized time. D．attend school for nine weeks before a vacation.