The income of A is \({\frac{2}{3}}\) of B's income and the expenditure of A is \({\frac{3}{4}}\) of B's expenditure. If \({\frac{1}{3}}\) of the income of B is equal to the expenditure of A, then the ratio of the savings of A to those of B is:
1
5 ∶ 3
2
4 ∶ 3
3
3 ∶ 5
4
3 ∶ 4