Refer to the Above Diagram, Where S_d and D_d Are

Refer to the above diagram, where S_d and D_d are the domestic supply and demand for a product and P_c is the world price of that product.S_d + Q is the product supply curve after an import quota is imposed.The size of the import quota:

A) is vz.
B) is vy.
C) is wy.
D) cannot be determined.