INLAND ONLY What MAY be used to indicate the presence of a partly submerged object being towed?

Correct Answer: Option C — The beam of a searchlight from the towing vessel shown in the direction of the tow

Under Inland Navigation Rules, for the condition where 'What MAY be used to indicate the presence of a partly submerged object being towed', the correct requirement is: 'The beam of a search light from the towing vessel shown in the direction of the tow'. This standard ensures clear navigational intent and collision avoidance.