The correct option is B Convention of conservatism
Conservatism convention- This convention ensures that uncertainties and risks inherent in business transactions should be given a proper consideration. as per this convention the accountants follow the rule 'anticipate no profit but provide for all possible losses'.
Purchase ==Rs. 25,00,00025,00,000; 80%80% of the goods have been sold.
So, cost of goods sold ==Rs. 20,00,00020,00,000
Stock remains at cost of Rs. 5,00,0005,00,000.
Since, market value of the stock left is Rs. 7,50,0007,50,000 which is higher than the cost of stock. So, stock is valued at Rs. 5,00,0005,00,000.