Vessels should maintain a sharp lookout，especially during December through March，when navigating the right whale’s only known calving grounds which lie off the coasts of（）.

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

A.To avoid immediate danger
B.When authorized by the rig superintendent
C.To comply with an operator's requirement
D.Under no conditions