Why does a nail stick to a magnet?

A) The nail is a magnet.
B) The nail contains some iron.
C) The nail weighs less than the magnet.
D) The nail is the same color as the magnet.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.