【单选题】A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°. Which action should be taken to remove this error during compass adjustment?
A.
If the blue ends of the magnets are aft,and the fore-and-aft tray is at the top,you should add some magnets
B.
If the blue ends of the magnets are aft you should lower the fore-and-aft tray
C.
If the blue ends of the magnets are aft,and the fore-and-aft tray is at the top,you should reverse the magnets
D.
If the blue ends of the magnets are forward,and the fore-and-aft tray is at the bottom,you should add some magnets