The Predominant Condition That Encourages Governments to Place Price Floors

The predominant condition that encourages governments to place price floors on markets is

A) the need for consumers to buy products at reasonable prices
B) a war situation in which excess demands occur resulting in price increases
C) a substantial increase in income, which shifts the demand curve to the left
D) a series of substantial crop failures that shift the supply curve of food to the left
E) technological changes that shift the supply curve to the right