The correct option is C Hen
Invertebrate and vertebrate are the two groups into which animal kingdom is further classified. Invertebrate animals are those which do not develop a vertebral column. Examples of invertebrates include insects like a cockroach, flatworm, earthworm, crabs, snails, etc. Vertebrates have fully developed vertebral column. They have proper skeletal structure. Examples include humans, birds, snakes. Thus, the correct answer is option C.