Concept:This refers to an extra commission paid to an agent who guarantees that the buyer will pay for goods supplied on credit.Explanation:In a del credere arrangement, the agent gives the principal a guarantee that the customer will make payment.If the buyer fails to pay, the del credere agent is responsible for the loss.In return for taking this extra risk, the agent receives an additional commission called del credere commission.This extra commission is separate from the ordinary commission earned by the agent.Answer:B. del credere