BOTH INTERNATIONAL & INLAND When two vessels are in immediate danger of collision, the stand-on vessel must __________.

Correct Answer: Option C — assist in taking whatever action is necessary to avoid collision

Under Inland Navigation Rules, for the condition where 'When two vessels are in immediate danger of collision, the stand-on vessel must', the correct requirement is: 'assist in taking whatever action is necessary to avoid collision'. This standard ensures clear navigational intent and collision avoidance.