An example of an anchor which has a stock is a（）.

A.go full ahead on the engine(s)
B.back away a few lengths to clear the buoy and then go ahead on the engines
C.go half ahead on the engines and put the rudder hard right
D.go half ahead on the engines and pass upstream of the buoy

A.aid turning the ship
B.obtain a fine bearing
C.increase ship swings to wind or tide
D.lighten the stress of anchor chains