In the year 2021 where was the 26th United Nations Climate Change Conference COP-26 held ?

The correct answer is (c). The 26th United Nations Climate Change Conference (COP26) was held in Glasgow, Scotland from 31 October to 12 November 2021. The conference was attended by over 200 countries and aimed to achieve a global agreement on climate change.

The other options are incorrect. New York is the most populous city in the United States and the capital of the state of New York. Tokyo is the capital of Japan and the most populous metropolitan area in the world. Beijing is the capital of China and the second most populous city in the world.