Identify the correct sequence of economic integration starting from the least integrated to the most integrated.
Multiple Choice

A. free trade area, customs union, economic union, political union, and common market
B.free trade area, customs union, common market, economic union, and political union
C.common market, free trade area, customs union, economic union, and political union
D.free trade area, common market, customs union, economic union, and political union
E.common market, free trade area, customs union, political union, and economic union