The wealth of a person A equals the sum of that of B and C. If he distributes half of his wealth between B and C in the ratio 2 : 1, then the wealth of B equals the sum of that A and C. Then, the fraction of wealth that A should distribute between B and C in the ratio 1 : 2, so that the wealth of C equals the sum of that of A and B is
(a) 1/2
(b) 2/3
(c) 3/4
(d) 1