THE SPEED OF A VESSEL ADJUSTED TO THAT OF A PILOT BOAT AT WHICH THE PILOT CAN SAFELY EMBARK is （）.

A.I require a pilot
B.Longitude follows
C.I am going ahead; follow me
D.Do not follow me

A.the Master or person in charge of the vessel
B.a person designated by the Master
C.a person on board to pilot the vessel
D.All of the above

A.is stayed
B.is situated
C.is placed
D.is located