The correct option is C Regulated markets to ensure fairness.
Allauddin Khilji implemented various reforms in administration. He abolished religious endowments, Inams (gift) lands and subsidy. He made taxation from the lower to the higher classes mandatory without any bias. He regulated markets, so that common people had access to goods at fair prices. Separate officials called Sahaan-e-mandi were appointed to ensure these regulations were followed in markets.