31.當兩艘動力船舶彼此以相反航向或幾乎相反航向對遇，而有碰撞危機時，下列何者為最佳的避碰行動？ (A)The big ship shall stop her engine. (B)The small ship shall stop her engine. (C)Each shall alter her course to starboard. (D)Each shall alter her course to port.