Most frog species have a distinct tadpole life stage. However, microhylids of Australia and New Guinea do not have a tadpole stage, but tadpole features appear and disappear during development in the eggs. This shows that
A) microhylids need to be very large.
B) microhylids evolved from an ancestor with a tadpole stage.
C)microhylids are more closely related to mammals than they are to frogs.
D)microhylids are an ancestor of modern frogs.
I'm not sure what could the answer be to that, I'm sure is not D though, I beleive is C.