Marsupials include the:

A) cat.
B) armadillo.
C) opossum.
D) crocodile.
E) spiny anteater.

Marsupials are a group of mammals that carry and nurse their young in pouches. The opossum is the only marsupial found in North America and is known for its reproductive method involving a pouch. The other animals listed do not have this characteristic; cats are placental mammals, armadillos are part of the Xenarthra order, crocodiles are reptiles, and the spiny anteater (echidna) is a monotreme, which is an egg-laying mammal.