Concept:A del-credere agent is one who guarantees the payment of debts for the principal.Explanation:When goods are sold on credit, the del-credere agent takes responsibility for the buyer’s ability to pay.If the buyer fails to pay, the agent indemnifies the principal for the loss.Because of this extra risk and guarantee, the agent receives an extra commission called del-credere commission.Therefore, the person who earns extra commission for guaranteeing debts is the del-credere agent.Answer:D. del-credere agent