Arrange the following trade blocks in ascending order accoridng to the number of member nations.

(A) NAFTA (North American Free Trade Association)
(B) EU (European Union)
(C) SAFTA (Sourth Asian Free-Trade Agreement)
(D) OPEC (Organisation of Petroleum Exporting Countries)

Choose the correct answer from the options given below:

(A), (C), (D), (B)

The correct answer is Option (1) → (A), (C), (D), (B)

(A) NAFTA (North American Free Trade Association)- U.S.A., Canada and Mexico (3)

(C) SAFTA (South Asian Free-Trade Agreement)- Bangladesh, Maldives, Bhutan, Nepal, India, Pakistan and Sri Lanka (7)

(D) OPEC (Organisation of Petroleum Exporting Countries)- Algeria, Indonesia, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar, Saudi Arabia, U.A.E. and Venezuela (11)

(B) EU (European Union)- Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Netherlands and United Kingdom (28)