According to regulations, how many B-II hand portable fire extinguishers are required in the cargo tank area of an unmanned, cargo pump-equipped tank barge while engaged in transferring grade B flammable liquids?

Correct Answer: Option B — Two

Title 46 CFR 34.50-10(a) mandates that unmanned tank barges equipped with cargo pumps must have at least two B-II hand-portable fire extinguishers in the cargo pump area during the transfer of Grade B flammable liquids to ensure immediate fire suppression capability.