Concept:Swachh Survekshan 2020 awarded cities in different categories for cleanliness and innovation practices.Explanation:Chennai won the award for best megacity in innovation and best practices in Swachh Survekshan 2020.Greater Hyderabad received the award for best megacity in citizen feedback.Bengaluru was recognised as the best self-sustainable megacity.Therefore, among the given options, Chennai is the correct match for this category.Answer:Option C: Chennai