The Figure Given Below Depicts the Milk Market

The figure given below depicts the milk market. The horizontal line, P, represents a price ceiling imposed by the government. Which of the following is true?

A) In equilibrium, the quantity demanded is 800 gallons.
B) There is a surplus when price per gallon is $1.
C) The quantity demanded at the price ceiling will equal the quantity produced.
D) The equilibrium price would be $1 per unit without the price ceiling.
E) The quantity supplied at the price ceiling is 500 gallons.