Final answer:
A business can use discounts and sales to promote its products and increase sales revenue.
Step-by-step explanation:
When a business's sales revenue falls below expectations, one type of promotion it can use is discounts and sales. By offering lower prices or special deals, the business incentivizes customers to purchase their products, which can help increase sales and revenue. This type of promotion is effective because it appeals to customers' desire for discounts and savings.