Answer : 3. "Uttar Pradesh"
Explanation :

Adani Total Energy Biomass Limited (ATBL), a subsidiary of Adani Total Gas Limited (ATGL), has commissioned the first phase of Barsana biogas plant in Mathura, Uttar Pradesh. The total capacity of this project, developed in three phases, will be 600 tonnes per day, which will produce 42 tonnes per day compressed biogas (CBG) and 217 tonnes per day organic fertilizer. It is set to become India's largest agro-waste-based bio-CNG plant, costing over ₹200 crore, using advanced anaerobic digestion technology to improve sustainability and reduce greenhouse gas emissions.