A is chasing B in the same interval of time. A jumps 8 times, while B jumps 6 times.
But the distance covered by A in 7 jumps is the same as that of B in 5 jumps. The ratio between the speeds of A and B is ________.

A

32 : 24

B

30 : 56

C

20 : 21

D

28 : 36