A, B, C enter into a partnership. A contributes $\frac{2^{th}}{5}$ of the capital, while C contributes an amount as much as A and B together contribute. Then the ratio of the capitals is :

1 : 2 : 4 1 : 4 : 5 4 : 1 : 5 3 : 2 : 5

4 : 1 : 5