单选题Particular care is needed when navigating in the vicinity of（）as very few of these features have been fully surveyed to modern standards to determine their correct position，full extent，or the least depth over them.ASW of Cocos IslandsBoceanic dangers or seamountsCundiscovered dangersDthe continental shelf
单选题
Particular care is needed when navigating in the vicinity of（）as very few of these features have been fully surveyed to modern standards to determine their correct position，full extent，or the least depth over them.
A
SW of Cocos Islands
B
oceanic dangers or seamounts
C
undiscovered dangers
D
the continental shelf
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