BOTH INTERNATIONAL & INLAND In which situation would risk of collision definitely exist?

Correct Answer: Option D — A vessel is on your starboard quarter, range decreasing, bearing is constant.

Under Inland Navigation Rules, for the condition where 'In which situation would risk of collision definitely exist', the correct requirement is: 'A vessel is on your starboard quarter, range decreasing, bearing is constant.'. This standard ensures clear navigational intent and collision avoidance.