There are 12 guppies and 8 catfish in an aquarium.
Which phrase describes a ratio relationship between the two quantities?
A the number of guppies in the aquarium compared to the number of guppies in the aquarium
B the number of guppies in the aquarium compared to the number of catfish in the aquarium
C the number of guppies in the aquarium compared to the number of angel fish in the aquarium
D the number of guppies in the aquarium compared to the number of catfish in a pond