This Problem Will Be Easier If You Have Done Problem

This problem will be easier if you have done Problem 3. The inverse demand function for grapefruit is defined by the equation p = 122 - 4q, where q is the number of units sold. The inverse supply function is defined by p = 8 + 2q. A tax of $12 is imposed on suppliers for each unit of grapefruit that they sell. When the tax is imposed, the quantity of grapefruit sold falls to

A) 15.
B) 13.
C) 19.
D) 17.
E) 18.