Correct Answer: (d) 21st
Solution:'CoP-21', the 21st round of General Conference on Climate Change to be held under the auspices of the UNFCCC, was held in Paris, France from November 30 to December 11, 2015. The conference expressed a commitment to set a limit for the 21st century average temperature, up to a maximum of 2°C above pre-industrial levels. CoP-22 concluded in Marrakesh (Morocco) on November, 2016. CoP-23 was held in Bonn (Germany) in November 2017. The CoP-24 was held between 2nd and 14th December, 2018 in Katowice, Poland. The CoP-25 was held in Madrid, Spain from 2nd to 13th December, 2019. The CoP-26 was held in Glosgow, Scotland in November, 2021. CoP-27 took place in Sharm El Sheikh, Egypt. CoP-28 was held in Dubai, UAE from 30th November to 13th December, 2023.