19. Which one of the following statements expresses a true proportion?
O A. 3:4 = 9:12
O B. 7:9 = 8:9
OC. 2:1 = 1:2
O D.54:9 = 6:3
![19 Which one of the following statements expresses a true proportion O A 34 912 O B 79 89 OC 21 12 O D549 63 class=](https://us-static.z-dn.net/files/d7a/6cd7d4e905fcca3f4f1130de13d15326.png)