The incomes of A, B and C are in the ratio 7 : 9 : 12 and their spending are in the ratio 8 : 9 : 15. If A saves 1/4 th of his income, then the savings of A, B and C are in the ratio of

(a) 69 : 56 : 48

(b) 47 : 74 : 99

(c) 37: 72 : 49

(d) 56: 99 : 69