You may BEST turn a twin-screw vessel about，to the right，in a narrow channel by using（）.

You may BEST turn a twin-screw vessel about，to the right，in a narrow channel by using（）.
A.both engines ahead and helm
B.one engine only
C.port engine ahead and the starboard engine astern
D.both engines astern and use helm
正确答案：port engine ahead and the starboard engine astern