World Summit on "Sustainable Development" in 2002 was held in:

The correct answer is Option (2) → South Africa

Option (2) South Africa — Correct. The World Summit on Sustainable Development was held in 2002 in Johannesburg, South Africa. There 190 countries pledged to reduce the loss of biodiversity by 2010.

NCERT Extract:
How Do We Conserve Biodiversity? – “… Biodiversity knows no political boundaries and its conservation is therefore a collective responsibility of all nations. The historic Convention on Biological Diversity (‘The Earth Summit’) held in Rio de Janeiro in 1992, called upon all nations to take appropriate measures for conservation of biodiversity and sustainable utilisation of its benefits. In a follow-up, the World Summit on Sustainable Development held in 2002 in Johannesburg, South Africa, 190 countries pledged their commitment to achieve by 2010, a significant reduction in the current rate of biodiversity loss at global, regional and local levels.”