Refer to the Accompanying Graph, Where S_d and D_d Are

Refer to the accompanying graph, where S_d and D_d are the domestic supply and demand curves for a product. The world price of the product is $6. If the market is open to international trade but there is a tariff of $2 per unit imposed, the total government revenue generated by the tariff would be

A) $40.
B) $60.
C) $80.
D) $100.