You are in charge of a stand-on vessel in acrossing situation.The other vessel is1.5miles to port.You believe that risk of collision exists.You should______.
A.take avoiding action immediately upon determining that risk of collisionexists
B.immediately sound the danger signal
C.take avoiding action only after providing the give-way vessel time to take action，and determining thather action is not appropriate
D.hold course and speed until the point of extremis，and then sound the danger signal，taking what ever action will be stavert collision
正确答案是C