Three years ago, the ratio of the age of A to that of B was 8 ∶ 9. Five years hence, the ratio of the age of A to that of B will be 10 ∶ 11. If at present, C is 8 years younger than A, then the ratio of the present age of B to that of C is:
1
13 ∶ 11
2
13 ∶ 9
3
11 ∶ 7
4
12 ∶ 7