Which scenario below is an example of consumer surplus?

• George is willing to pay up to $20,000 for a car, but he finds one he likes for $15,000.
• Tom usually charges $75/hour but in certain cases is willing to go as low as $65/hour.
• A grocery store that usually charges $7/pound for beef is willing to lower the price to $5/pound when a huge shipment comes in.
• A car dealership sells exactly as many cars as it has in stock.