When a vessel is in any doubt as to whether such a situation exists she shall（）that it does exist and act accordingly.

A.Nova Scotia
B.Maine and Massachusetts
C.Georgia and NE Florida
D.California and Mexico

A.A vessel restricted in her ability to maneuver
B.A vessel not under command
C.A vessel constrained by her draught
D.A vessel not under way

A.Engaged in fishing
B.Mine sweeping
C.A pilot boat
D.Under sail