单项选择题
It's 4:30 . The students in Class 2 are in the classroom. Li Lei and Jim take off their coat and put them on the chair. They put their bags in their desks. They think it's time to go and play games. Li lei says 'Excuse me, Wei Fang. Can you look after my coat and bag?' 'Sorry! I must go home.'
What time is it now?（）A．3:50.
B．4:30.
C．5:30.