In the market for widgets, the supply curve is the typical upward-sloping straight line, and the demand curve is the typical downward-sloping straight line. The equilibrium quantity in the market for widgets is 200 per month when there is no tax. Then a tax of $5 per widget is imposed. As a result, the government is able to raise $800 per month in tax revenue. We can conclude that the equilibrium quantity of widgets hasfallenby

a. 75 per month.

b. 100 per month.

c. 50 per month.

d. 40 per month.