Final answer:
The b) arctic fox's fur changes colour with the seasons for camouflage, with a white winter coat for blending into the snow and a darker summer coat for the tundra environment.
Step-by-step explanation:
The animal that has fur that changes colour with the season is the Arctic fox. This well-adapted predator has a white winter coat that allows it to blend into the snowy environment, which is an important adaptation for both hunting prey and eluding predators. As the seasons change, the arctic fox's fur changes to a darker colour in the summer, providing camouflage among the rocks and plants of the tundra. This colour change is due to temperature-sensitive proteins that result in the fur's pigment not folding correctly at colder temperatures, leading to the white winter coat.