You are underway in reduced visibility.You hear the fog signal of another vessel about 20° on your starboard bow.Risk of collision may exist.You should（）.
A. alter course to starboard to pass around the other vessel
B. reduce your speed to bare steerageway
C. slow your engines and let the other vessel pass ahead of you
D. alter course to port to pass the other vessel on its portside
微信支付 
支付宝支付