Why are two sides different color on a frog

Frogs change color to help hide from predators by matching the colors of their surroundings. The also change color to help control their body temperature as some colors absorb more or less light and can cool or warm them up.

"The Dorsal surface is a green color and has spots. The Ventral surface is a lighter green color. It helps them camouflage itself from predators. The bottom of the frog is a lighter color then the top" So to camouflage themselves they adapted over time to have this certain coloring difference on their skin to adapt to their environment and survive.

i'm pretty sure it is letter c.) car

i think that the answer is c