The number of the escaped prisoners is ______.

A．restructure the prison service.
B．discipline some prison officers.
C．recruit more security staff.
D．look into security conditions.

A．A section of M4 motorway has been closed to traffic.
B．There has been a serious car accident on the toad.
C．No person has been reported to be dead.
D．Rescue operations have been going on throughout the day.