Answer: A price ceiling
Step-by-step explanation:
A price ceiling is one of the type price control concept which is developed by the government so that they can legally limit on the high price of the products for the purpose of maintain the market equilibrium.
The price ceiling concept is basically using by the government so that they can protect the consumers from the expensive conditions when the various types of companies selling their products and the services at high price.
According to the given question, a price ceiling concept is best illustrating the given example of united states about the high price of gas. Therefore, Price ceiling is the correct answer.