The correct option is A railway
The practice of a separate Railway Budget started in 1924 during the British rule in India. During those days, Railways was the largest industrial asset of the country and used to occupy a significant portion of the budgetary allocations (75 to 85 %). Since the Railways then constituted such a large portion of the General Budget, it was recommended by the Britishers to have a seperate budget for railways for better policy formation.