Answer : 4. "Varanasi"
Explanation :

The G20 Sustainable Finance Working Group (SFWG) meeting saw the participation of over 80 representatives from G20 member states, invited countries and international organizations including the World Bank, New Development Bank, NGFS. The Working Group aims to mobilize sustainable finance to help ensure global development and sustainability and promote the transition towards greener, more resilient and inclusive societies and economies. The G20 Sustainable Finance Report, 2023 was also finalized at the meeting held in Varanasi.