Final answer:
d. Buying a familiar brand of toothpaste best exemplifies limited problem solving because it is a routine purchase that does not require much thought or consideration.
Step-by-step explanation:
The purchase situation that best exemplifies limited problem solving is d. buying a familiar brand of toothpaste.
Limited problem solving occurs when a consumer makes a decision to purchase a product without extensive research or evaluation because they have prior knowledge and experience with the product. In this case, buying a familiar brand of toothpaste is a routine purchase that does not require much thought or consideration.