The Diagram Below Shows the Domestic Demand and Supply Curves

The diagram below shows the domestic demand and supply curves for denim jeans in Canada.The prevailing world price is P_W.Assume that all jeans are identical. FIGURE 33-2
-Refer to Figure 33-2.Suppose Canada has free trade in jeans and then imposes a tariff of $t per pair.Canada's jean-producing firms will gain producer surplus equal to the area

A) A.
B) A + B + C.
C) A + D.
D) D.
E) D + E + F + G + H.