Which type of discount is applied based on the quantity of goods purchased?

The correct choice is the quantity discount, which is specifically designed to incentivize larger purchases by offering a reduced price based on the amount of goods bought. This type of discount encourages customers to buy in bulk, benefiting both the buyer with savings on larger orders and the seller with greater sales volume.

A seasonal discount refers to price reductions that are offered at specific times of the year, typically tied to holidays or seasons, rather than based on purchase quantities. Promotional discounts are temporary price reductions aimed at encouraging customers to try a product or service, which is distinct from offering price breaks for bulk purchases. A cash discount, on the other hand, is a reduction in price given for prompt payment, rather than for ordering a larger quantity of goods. Each of these alternatives has its unique application and rationale that does not align with the criteria of being quantity-based.