The correct option is D All of the above
Muhammad bin Tughlaq pursued a harsh taxation policy at the start as a result of which agricultural production suffered. To increase production and bring more land under cultivation, he appointed an official called Diwan-i-amir-i-Koh and tasked him to bring under cultivation a 100*100 sq km area. The scheme failed due to low fertility of soil, corruption, embezzlement of funds, bad management and lack of attention from the Sultan.