问题详情

At which of the following times will the bus leave the main hall？
A．8: 00,9: 00,10:00,11: 00.
B．8: 30,9: 30,10: 30,11: 30.
C．8: 30,9: 00,9: 30,10: 00.
D．8: 00,9: 30,11: 00,12: 30.请帮忙给出正确答案和分析，谢谢！