During cargo operations, a deck fire has occurred due to a leaking cargo line. You should FIRST __________.

Correct Answer: Option A — stop the transfer of cargo

In the event of a cargo-related fire, the immediate priority is to eliminate the fuel source. Stopping the cargo transfer pump and closing the manifold valves prevents additional fuel from feeding the fire, which is the most critical step before attempting to extinguish the flames with foam or other agents.