Price Quantity Demanded Quantity Supplied
$12.00 0 36
$10.00 3 30
$8.00 6 24
$6.00 9 18
$4.00 12 12
$2.00 15 6
$0.00 18 0

Refer to the table above. Both the demand curve and the supply curve are straight lines. At equilibrium, consumer surplus is

a. $48.
b. $42
c. $36
d. $24