In which of the following circumstances would a cartel be most likely to work ?

• A. The market for copper, where there are very few producers and the product is standardized.
• B. The fast-food market where there are a large number of producers but the demand for fast food is inelastic
• C. The coffee market where the product is standardized and there are a large number of coffee growers.
• D. The automobile industry, where there are few producers but there is great product differentiation.