The correct option is D Sanctuary is a natural habitat for animals and birds.
Sanctuary is a natural habitat and zoo is an artificial habitat for animals and birds. A zoo might buy, sell, breed, or trade animals, or even capture animals from the wild. They protect the animals from being poached. A sanctuary does not breed, buy, sell or trade animals. A sanctuary also does not even capture animals from the wild. It acquires animals which can no longer survive in the wild. All animals and birds in a sanctuary are protected in their own natural habitat.