A small confectioner bought a certain number of pastries flavoured pineapple, mango and black-forest from the bakery, giving for each pasty as many rupees as there were pastry of that kind; altogether he bought 23 pastries and spent Rs 211. Find the number of each kind of pastry that he bought, if mango pastry is cheaper than pineapple pastry and dearer than black-forest pastry. (a) (10, 9, 4)    (b) (11, 9, 3)    (c) (10, 8, 5)    (d) (11, 8, 4)