If the overflow tank high-level alarm sounds while the fuel oil tanks are being topped off, the engineer should __________.

Correct Answer: Option B — stop the fuel oil pumping operation

High-level alarms indicate an imminent overflow condition. Immediate cessation of the fuel transfer operation is the only safe procedure to prevent an accidental discharge into the environment. Once the flow is stopped, the engineer can investigate the cause and safely manage the remaining fuel in the system.