BOTH INTERNATIONAL & INLAND Which statement concerning whistle signals is FALSE?

Correct Answer: Option C — A vessel engaged in towing in fog shall sound a fog signal at intervals of less than one minute.

Under Inland Navigation Rules, for the condition where 'Which statement concerning whistle signals is FALSE', the correct requirement is: 'A vessel engaged in towing in fog shall sound a fog signal at intervals of one minute.'. This standard ensures clear navigational intent and collision avoidance.