If the Quantity Demanded at a Price of $10 Is

If the quantity demanded at a price of $10 is 2,000 and the quantity demanded at a price of $8 is 2,400, a price-discriminating monopolist would want to:

A) charge all consumers the higher price of $10 and sell 2,000 units.
B) charge all consumers $8 in order to increase quantity sold to 2,400.
C) sell 2,000 units for $8 each and then sell an additional 400 units for $10 each.
D) sell 2,000 units for $10 each and then sell an additional 400 units for $8 each.