Final answer:
David is using a method called comparison shopping to make a well-informed decision about buying tires for his Audi.
Step-by-step explanation:
In his decision-making process, David is using a method called comparison shopping. Comparison shopping involves looking at different options and evaluating them based on factors such as price, quality, and convenience. By calling multiple stores to inquire about tire prices, David is gathering information to make a well-informed decision.
Comparison shopping is a common practice for consumers when they are looking to make a purchase. It allows them to find the best deal and ensure they are getting the best value for their money. By considering different options, David can also assess the customer service and expertise of each store before making a final decision.