Internalisation of 'negative externality' (in the case of stubble burning by the farmers) means: a. Making the price of paddy/wheat (the polluting commodities) to reflect the private cost incurred by the farmers b. Making the price of paddy/wheat to reflect the external cost imposed by stubble burning c. Making the price of paddy/wheat to reflect the transaction cost of paddy/wheat cultivation d. Making the price of wheat and rice to reflect the private benefit of paddy/wheat cultivation