Which of the Following Scenarios Best Illustrates Reinforcement in Purchasing

Which of the following scenarios best illustrates reinforcement in purchasing decisions?

A) A chef purchases mushrooms for a second time from a wholesaler, even though the first order was disappointing.
B) An appliance distributor replaces a dishwasher free of charge and provides excellent after-sales service.
C) A needle on the gas gauge signals a driver to pull into a gas station.
D) The smell of hot dogs at a ballpark induces an obese man to order "a dog with everything on it."