When action to avoid a close quarters situation is taken， a course change alone may be the most effective action provided that（）.

When action to avoid a close quarters situation is taken， a course change alone may be the most effective action provided that（）.
A.it is done in a succession of small course changes
B.it is not done too early
C.it is a large course change
D.the course change is to starboard
正确答案：it is a large course change