Given:
A) 6:9
It shows that the simplest form of 6:9 is 2:3.
B) 10:24
It shows that the simplest form of 10:24 is 5:12.
C) 4:36
It shows that the simplest form of 4:36 is 1:9.
D) 8:15
It implies that the ratio of 8:15 is in the simplest form.
Answer: D) 8:15