Correct option is C
Sushma Swaraj, who was then the Minister of External Affairs, represented India at the first International Yoga Day celebrations held at the United Nations Headquarters in New York on 21st June 2015. The event was significant as it marked the global recognition of yoga, with the day being observed by numerous countries worldwide. It was a major initiative led by India, following a proposal by Prime Minister Narendra Modi at the United Nations General Assembly (UNGA) in 2014. Sushma Swaraj's presence was crucial in showcasing India's leadership and cultural heritage on a global stage.