A Customs Union Is an Agreement That Involves Two or More

A customs union is an agreement that involves two or more countries

A) that agree to eliminate tariffs and other trade restrictions on most or all mutual trade of their own goods and services,where each country has different tariffs for imports from non-member countries.
B) that not only agree to eliminate tariffs and other trade restrictions on most or all mutual trade but also agree to a common set of trade barriers to imports from non-member countries.
C) eliminating trade restrictions on most or all mutual trade,maintaining a common set of trade barriers against imports from non-member countries,and permitting mobility of capital and labour among member countries.
D) eliminating trade restrictions on most or all mutual trade,maintaining a common set of trade barriers against imports from non-member countries,permitting mobility of capital and labour among member countries,and adopting a single currency.
E) that dissolve their borders to become a single political entity.