The sign used to caution persons approaching the gangway of a tank barge during cargo transfer should state which of the following?

Correct Answer: Option C — "Warning, No Smoking, No Open Lights, No Visitors"

33 CFR 154.740 requires that warning signs be displayed at the gangway during cargo transfer. These signs must clearly state 'Warning, No Smoking, No Open Lights, No Visitors' to alert all personnel and visitors to the inherent fire and explosion hazards associated with the transfer of flammable or combustible liquids.