How should fuel be dispensed into a portable container?

Dispensing fuel into a portable container should involve manually holding open the hose nozzle valve during operation. This method allows the person dispensing the fuel to maintain control over the flow, ensuring safety and preventing spills or overfilling. By manually holding the nozzle, the operator can monitor the amount of fuel being transferred and stop the flow if necessary, which is vital for safety in preventing accidents or environmental hazards.

Using any available hose without supervision would not provide the oversight necessary to ensure responsible fuel handling practices, potentially leading to dangerous situations. Employing a pump that does not require approval can introduce risks if the pump is not properly maintained or if it does not meet safety standards. Finally, dispensing fuel from large tanks without capacity restrictions poses risks of overfilling and environmental contamination, which is against best practices in fuel dispensing. Therefore, option B is the only choice that emphasizes safety and control during the dispensing process.