A trade-diverting customs union is more likely to lead to trade creation:

A.

the more complementary rather than competitive are the economies of the nations forming the customs union.

B.

the lower are the customs union's barriers on trade with the rest of the world.

C.

the smaller is the number of countries forming the customs union and the smaller their size.

D.

the lower are the pre-union trade barriers of the member countries.