Option c is the correct answer. Sher Shah Suri introduced the system of patta and qabuliyat to help the peasants. Patta is a document that gave the peasants ownership of the land they cultivated. Qabuliyat is a document that was signed by the peasants, agreeing to pay the land revenue to the government. This system helped to protect the peasants from exploitation by the government officials and intermediaries. It also gave the peasants a sense of security and encouraged them to improve their land.