BOTH INTERNATIONAL & INLAND In reduced visibility, you hear two prolonged blasts of a whistle. This signal is sounded by a __________.

Correct Answer: Option D — power-driven vessel dead in the water

Under Inland Navigation Rules, for the condition where 'In reduced visibility, you hear two prolonged blasts of a whistle. This signal is sounded by a', the correct requirement is: 'power-driven vessel dead in the water'. This standard ensures clear navigational intent and collision avoidance.