The answer is D. Koala.
Beavers, alpacas, and walruses are all mammals. Beavers are rodents, alpacas are camelids, and walruses are pinnipeds. Koalas, on the other hand, are marsupials. Marsupials are mammals that give birth to very underdeveloped young, which then crawl into a pouch on the mother’s stomach to continue developing.
Beavers are large rodents that are native to North America and Eurasia. They are known for their large, flat tails and their ability to build dams. Alpacas are domesticated members of the camel family that are native to South America. They are raised for their wool, which is used to make clothing and other textiles. Walruses are large marine mammals that are native to the Arctic and subarctic regions. They are known for their long tusks, which they use to dig for food and to defend themselves. Koalas are small, arboreal marsupials that are native to Australia. They are known for their thick fur, which is brown or gray in color. They are also known for their diet, which consists mainly of eucalyptus leaves.