International Trade Can Be Mutually Advantageous Because It

International trade can be mutually advantageous because it

A) encourages the adoption of sound institutions and policies.
B) reduces the competitiveness of domestic industries and, thereby, makes it easier for the domestic producers to raise their prices.
C) permits the trading partners to take advantage of reductions in per-unit costs in industries where economies of scale are important.
D) does all of the above.
E) does both a and c.