At night while the ship is tied up to the

问题：

At night while the ship is tied up to the dock，a fire breaks out in a cargo hatch. After sounding the alarm，what should the person on watch do?（）

A.Begin fighting the fire immediately

B.Await further orders from the Master

C.Let go the lines to let the vessel drift to an anchorage

D.Send a person to summon the shore authorities