Explanation:

- The Stockholm Convention is a global treaty aimed at eliminating or reducing the release of persistent organic pollutants (POPs), which pose significant risks to human health and the environment.

- Ratification is the formal approval process by which a country becomes a party to an international agreement.

- Option:1, 2005 – This is not the year when India ratified the Stockholm Convention.

- Option:2, 2006 – India ratified the Stockholm Convention in this year, committing to the global efforts against POPs.

- Option:3, 2002 – This was the year when the Stockholm Convention was adopted at a global level, not when India ratified.

- Option:4, 2010 – This is incorrect; India did not ratify the convention in this year.