Which type of power may a towing vessel use to drive the cargo pumps of a tank barge?

Correct Answer: Option B — Steam, air, or electricity

46 CFR 35.35-50 permits the use of steam, air, or electricity to drive cargo pumps on tank barges. These power sources must be compatible with the vessel's hazardous area classification and safety systems to ensure that cargo transfer operations are conducted without risk of ignition or equipment failure.