Final answer:
d. Marketing is the business function responsible for sales, generating customer demand, and understanding customer wants and needs.
Step-by-step explanation:
The business function that is responsible for sales, generating customer demand, and understanding customer wants and needs is d. marketing.
Marketing involves various activities such as market research, advertising, promotions, and sales strategies to attract customers and meet their needs.
For example, a marketing team may conduct surveys, analyze competition, and develop targeted advertising campaigns to create demand for a product or service.