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?（）
- AIf the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should add some magnets.
- BIf the blue ends of the magnets are aft you should lower the fore-and-aft tray
- CIf the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should reverse the magnets
- DIf the blue ends of the magnets are forward，and the fore-and-aft tray is at the bottom，you should add some magnet