Following the imposition of a price floor $2 above the equilibrium price, irate buyers convince Congress to repeal the price floor and to impose a price ceiling $1 below the former price floor.
Price Quantity Demanded Quantity Supplied
$0 15 0
$1 13 3
$2 11 6
$3 9 9
$4 7 12
$5 5 15
$6 3 18
The resulting shortage is
A. 0 units.
B. 2 units.
C. 5 units.
D. 7 units.