You are underway in heavy fog. You hear the fog signal of a vess

You are underway in heavy fog. You hear the fog signal of a vessel which is somewhere ahead of your vessel. You must ______.

A.slow to moderate speed and navigate with caution

B.maintain speed and sound the danger signal

C.stop engines and navigate with caution

D.slow to bare steerageway and navigate with caution

正确答案是D