Concept:The launch of the Fit India Mobile App in 2021 marked the second anniversary of the Fit India Movement.Explanation:The Fit India Movement was launched in 2019.The app was launched on 29th August, 2021, on National Sports Day.National Sports Day is celebrated on the birth anniversary of hockey legend Major Dhyan Chand.Completing two years from 2019 to 2021 means the movement had completed two years of implementation.Hence, the launch marked two years of the Fit India Movement.Answer:A. Two