At sea, you are approaching a small vessel and see that it has the signal flag "P" hoisted. What should you do?

A
Proceed on present course and speed since the vessel is stopped and making no way through the water.
B
Keep clear of the vessel because it has a diver down.
C
Attempt to call the vessel on VHF radiotelephone because someone on board requires medical assistance.
D
Approach with caution because the vessel is a fishing vessel and its nets are fouled on an obstruction.
E