Which one of the following nations adopted its first democratic Consti

Which one of the following nations adopted its first democratic Constitution in September 2015?

Bhutan
Myanmar
Nepal
Singapore
This question was previously asked in
UPSC NDA-1 – 2016
Nepal adopted its first fully democratic and secular federal Constitution on September 20, 2015.
– The Constitution, officially titled the ‘Constitution of Nepal 2072’ (Nepali year Bikram Samvat 2072), was promulgated by the Constituent Assembly of Nepal.
– Its adoption marked the culmination of a long peace process following the end of the decade-long Maoist insurgency and the abolition of the monarchy in 2008.
– It established Nepal as a federal democratic republican state with seven provinces.
Bhutan adopted its first Constitution in 2008, transitioning towards a constitutional monarchy. Myanmar has had several constitutions, with the current one adopted in 2008. Singapore has been independent since 1965 with its own constitution.