Answer:
The correct answer is letter "B": limits on interest rates charged by credit card companies.
Explanation:
A Price Ceiling is a maximum amount a seller can charge for a product or service. A regulating authority -usually the local government- enforces price ceilings and they are typically set to protect low-income consumers for being priced-out of markets of essential goods and services.
Apartments provide a common example. Some cities provide price ceilings on what the landlords can charge for rent. A price ceiling in credit card interest rates would all into this category as well.