Your vessel is crossing a narrow channel.A vessel to port is within the channel and crossing your course.She is showing a black cylinder.What is your responsibility？

Your vessel is crossing a narrow channel.A vessel to port is within the channel and crossing your course.She is showing a black cylinder.What is your responsibility？
A.Hold your course and spee
B.Sound the danger signal.
C.Begin an exchange of passing signals.
D.Do not cross the channel if you might impede the other vessel.
正确答案：Do not cross the channel if you might impede the other vessel.