What is the ratio of 4/5 to 7/15?

A - 7/12
B - 1 5/7
C - 11/15
D - 1 4/11

My answer is B, 1 5/7, but I just wanted to make sure.

4/5 : 7/15

= 12/15: 7/15
= 12 : 7

All the answers are single numbers.
Ratios state the relationships between two or more numbers