Some of these shoals have been disproved and are not charted. Nevertheless mariners should （）with particular caution in this area.

A.you can stop within your visibility range
B.the vessel is not subject to vibrations
C.you are traveling slower than surrounding vessels
D.you can take proper and effective action to avoid collision

A.the vessel will anchor at eastern anchorage and take supply at the western anchorage
B.the vessel will anchor at western anchorage and take supply at the eastern anchorage
C.the vessel will anchor at eastern anchorage and take supply there
D.the vessel will anchor at western anchorage and take supply there

A.generally steady bearing and decreasing range
B.generally steady range and increasing bearing
C.increasing range and bearing
D.decreasing bearing only