Mammals

a. evolved from birds.

b. all give birth to live young.

c. all lay eggs.

d. have hair and mammary glands.

The best way to think of this is that we are mammals.

A. We didn't evolve from birds!

B. While that is partly true, but there is one egg-laying mammal, the Monotremes.

C. We do not lay eggs!

D. Is your answer.