Final answer:
When scheduling an appointment for Safety Recall work, dealership staff should confirm parts availability for the recall to ensure that the repair work can be completed efficiently.
Step-by-step explanation:
When setting an appointment for a customer who needs Safety Recall work on his vehicle, dealership staff should prioritize tasks critical to addressing the recall. Among the provided options, Confirming parts availability for the recall (B) is the most relevant task to include when setting the appointment. It ensures that when the customer arrives, the necessary parts for the Safety Recall are available, and the vehicle can be repaired without delay. Offering a discount on unrelated services (A), recommending a trade-in for a new vehicle (C), or promoting a different service campaign (D) do not directly pertain to the immediate need for recall repair work and should not be the priority in this scenario.