INLAND ONLY Two vessels are in a starboard to starboard meeting situation and will pass well clear approximately 1/4 mile apart. Which action should each vessel take?

Correct Answer: Option D — Sound a two blast whistle signal and maintain course.

Under Inland Navigation Rules, for the condition where 'Two vessels are in a starboard to starboard meeting situation and will pass well clear approximately 1/4 mile apart. Which action should each vessel take', the correct requirement is: 'Sound a two blast whistle signal and maintain course.'. This standard ensures clear navigational intent and collision avoidance.