On which issue had the Left Party withdrawn its support during the UPA government's second tenure?

Indo-US Nuclear Deal

The correct answer is Option (2) → Indo-US Nuclear Deal

During the UPA-I government (2004–2008), the Left parties were providing outside support. They withdrew their support in 2008 over opposition to the Indo–US Civil Nuclear Agreement, arguing that it compromised India’s sovereignty and aligned the country too closely with the United States.