-The Above Figure Shows the Market for Rice in Japan

-The above figure shows the market for rice in Japan. S2 represents the domestic supply curve, and S1 represents the world supply curve. Suppose a free market exists. An import quota of 30 units would

A) cause consumer surplus to fall by "e."
B) cause social welfare to fall by $30.
C) increase producer surplus by "d."
D) have no effect.