International Solar Alliance (ISA) is the alliance of countries most of which lie partially or completely

Correct Option: Between tropic of cancer and tropic of capricorn

Explanation:
The International Solar Alliance (ISA) is a collaborative treaty-based alliance initiated jointly by India and France on November 30, 2015, at the United Nations Climate Change Conference (COP21) held in Paris, France.

The primary objective of this alliance is to facilitate the efficient consumption and development of solar energy to reduce dependency on fossil fuels. To maximize the impact, the initiative originally targeted solar-resource-rich countries that lie either completely or partially between the Tropic of Cancer and the Tropic of Capricorn.

These geographical regions, commonly known as the tropics, receive the maximum amount of sunlight and solar radiation throughout the year. Because of this abundance of solar energy, these "sunshine countries" hold the greatest potential for solar energy generation. Although membership in the ISA has since been opened to all member states of the United Nations, the core foundation of the alliance remains rooted in the countries situated between the Tropic of Cancer and the Tropic of Capricorn.