Match List-I with List-II relating to benefits and cost of economic integration and identify the option representing correct matching.

List-I	List-II
a. Trade creation	1. Movement of production and resources in opposite directions.
b. Trade diversion	2. Become active when a member country does not augment export but simply shifts its imports from low cost source to high cost source.
c. Trade deflection	3. Shifting the locus of production from high cost to low cost centre within the union.
d. Polarisation forces	4. Goods produced in a third country entering a free trade area through a member country having lower tariff.