Li Hua is the monitor of the class, so he should（）charge of this matter.

A．She brought the man the wrong dish.
B．She wanted to change the dish he had ordered.
C．She kept the man waiting for too long a time.
D．She brought the dish to the wrong customer.

A．Over an hour.
B．Half an hour.
C．Less than half an hour.
D．Less than an hour.