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 for a product. The world price of the product is $6. What would be the difference in the total revenue received by foreign producers after a quota of 20 units is imposed compared with the total revenue received by foreign producers when a $4 per unit tariff is imposed?

A) $0 revenue difference
B) $80 more revenue with a quota than with a tariff
C) $200 more revenue with a quota than with a tariff
D) $120 more revenue with a tariff than with a quota