​International Solar Alliance was conceptualized on the sidelines of:​

Correct option is A

The International Solar Alliance (ISA) was conceptualized during the 2015 United Nations Climate Change Conference, known as COP 21, held in Paris. This alliance was proposed jointly by India and France to promote the use of solar energy worldwide, particularly in countries located between the Tropics of Cancer and Capricorn that receive abundant sunlight. The ISA aims to facilitate cooperation, mobilize investments, and promote solar technology deployment to help mitigate climate change by reducing dependence on fossil fuels.

Hence, the correct answer is COP 21.

Information Booster:
COP 21 is also known as the Paris Agreement conference, where countries committed to limiting global temperature rise.

ISA focuses on solar energy development, reducing solar technology costs, and supporting solar projects in member countries.

It promotes research, knowledge sharing, and capacity building in solar energy.

The alliance targets developing countries, particularly those with high solar potential.

ISA was formally launched in 2015 after COP 21 and has over 120 member countries.

It is the first international treaty-based organization headquartered in India.

Additional Information:

COP 22 was held in Marrakech, Morocco, focusing on implementing the Paris Agreement.

COP 23 was held in Bonn, Germany, emphasizing the rules and guidelines for the Paris Agreement.

COP 24 was held in Katowice, Poland, focusing on finalizing the Paris Agreement rulebook.