Correct Answer: Whale, Bat, Kangaroo, Hippopotamus

Solution : The correct option is Whale, Bat, Kangaroo, Hippopotamus.

Whales are mammals—more precisely, they are marine animals. They give birth to live young, have warm blood, and create milk to nurture their young. Bats are mammals as well. They are the only animals that can sustained flight. They give birth to live offspring and feed them with milk, much like other mammals. The kangaroo is a marsupial mammal, which implies it is a member of the Marsupialia subgroup of mammals. They give birth to live young that are still developing in a pouch on the mother's belly after delivery. Hippopotamus are mammals. They are giant semi-aquatic animals that live an amphibious existence and are recognised for their enormous size. They are warm-blooded and give birth to live young.