Arrange the following in chronological order

A. Sri Lanka became an independent country
B. Formation of SAARC
C. Nepal adopted a new constitution
D. SAFTA came into effect

Choose the correct answer from the options given below:

A, B, D, C

The correct answer is option (4) - A, B, D, C

Sri Lanka became an Independent country - 1948.
SAARC was formed in the year - 1985.
Nepal adopted a new constitution - 2015.
SAFTA came into effect on 1st January 2006.