Concept:A quantity discount is a price reduction given to encourage the buyer to buy in bulk.Explanation:When a seller offers a quantity discount, the buyer receives a lower price per unit for ordering a larger amount.The main purpose of this discount is to motivate the customer to increase the size of their order.By purchasing more units at once, the buyer helps the seller reduce handling costs and move stock faster.Therefore, the incentive is designed to persuade the buyer to purchase more goods, not merely to pay early or quickly.Answer:D. purchase more.