When was Daman and Diu, which was earlier a separate Union Territory, merged with Dadra and Nagar Haveli?

January 2020

The correct answer is Option (1) → January 2020

The Dadra and Nagar Haveli and Daman and Diu (Merger of Union Territories) Act, 2019, was passed by Parliament in late 2019 and received presidential assent on 9 December 2019. The merger officially took effect on 26 January 2020, as notified by the Government of India and confirmed by official sources, including the Ministry of Home Affairs, the union territory's administration website, and Wikipedia. This created the new union territory of Dadra and Nagar Haveli and Daman and Diu, reducing administrative duplication between the formerly separate territories.