What must be checked before transporting a sealed load?

Answer: B — That the load is properly secured

Before transporting a sealed load, it is crucial to ensure that the load is properly secured. Proper securing of the load is vital for safe transportation, as unsecured loads can shift during transit, leading to potential accidents or damage to the cargo or vehicle. Securing the load helps maintain the balance and stability of the vehicle while on the road, preventing hazards for both the driver and other vehicles. Though checking the delivery schedule, the weight of the vehicle, and the expiration date of the cargo may be important in various contexts, they do not directly address the immediate safety concerns that arise from improperly secured loads. Ensuring that the load is firmly secured takes precedence as it directly affects the overall safety of the vehicle operation.