You are approaching another vessel and see that it has the signal flag “O” hoisted．What is your next action（）.
- AProceed on present course and speed since the vessel is requesting a pilot
- BAttempt to call the vessel on VHF radiotelephone and begin a search because the vessel has a man overboard
- CAttempt to call the vessel on VHF radiotelephone because it is disabled
- DApproach with caution because the vessel is stopped and making no way through the water