The correct answer is Behavioral adaptation.
There are two types of fur found on the body of the polar that is found in the colder regions.
The two layers of fur white above brown helps them to camouflages to the ice present around them. The white colored fur is present throughout the time when there is snow around them.
The brown colored fur appears when there is summer and the brown colored fur allows them to camouflage the environment.
This helps in increasing the chances of survival by hiding from predators.