The answer to the question regarding what best describes a frog are letter A and B or has four legs and breathes with lungs. Some people would probably say that frogs don’t have lungs because they have gills. It is true that they have gills, but it is only applicable to tadpoles. Once a tadpole grows, develops and mature into an adult frog, it then ultimately loses its gill and then develops lungs to help it breathe air.
It also has four legs, but it only appears once it becomes a full grown-frog. A tadpole only has two legs and a long tail, but once it grows and matures, it loses its tail and then grow another pair of legs.