During topping off of bunker tanks, the loading rate must be personally supervised by the __________.

Correct Answer: Option B — person in charge

The Person in Charge (PIC) is legally responsible for the entire transfer operation under 33 CFR 155.700. This individual must supervise the topping off process to ensure that tank levels are monitored closely, preventing overflows and ensuring that all safety protocols are strictly followed during the most critical phase.