Refer to the graph shown. Assume the market is initially in equilibrium at point b in the graph but the imposition of a per-unit tax on this product shifts the supply curve up from S0 to S1. The amount of revenue government will collect from this tax is equal to the:

A. area of the triangle bcd.
B. area of the triangle abc.
C. amount of the per-unit tax multiplied by Q1.
D. amount of the per-unit tax multiplied by Q2.

answer:

D. amount of the per-unit tax multiplied by Q2.