When was Sikkim declared as an Organic State?

Answer: Option C

Back in 2003, Sikkim officially took the decision to go organic

In the subsequent years, the state made a transformational shift by phasing out the use of chemical fertilizers and pesticides and imposing a complete ban on them

In January 2016, Prime Minister Narendra Modi formally declared Sikkim as India’s first fully organic state

While the groundwork and policy implementation had been progressing since 2003, the formal recognition came in early 2016

The United Nations has also acknowledged the efforts of North Eastern states, including Sikkim, in achieving sustainable development goals

Therefore, the correct answer is Option C: December 2016