BOTH INTERNATIONAL & INLAND You are making headway in fog and hear a fog signal of two prolonged blasts on your starboard quarter. You should __________.

Correct Answer: Option C — hold your course and speed

Under Inland Navigation Rules, for the condition where 'You are making headway in fog and hear a fog signal of two prolonged blasts on your starboard quarter. You should', the correct requirement is: 'hold your course and speed'. This standard ensures clear navigational intent and collision avoidance.