What Is the Difference Between an Apollo Asteroid and an Amor

What is the difference between an Apollo asteroid and an Amor asteroid?

A) Apollo asteroids cross the orbit of Earth, whereas Amor asteroids cross the orbit of Mars but not Earth's orbit.
B) Apollo asteroids orbit entirely inside Earth's orbit and therefore do not cross it, whereas Amor asteroids cross Earth's orbit and therefore might hit Earth.
C) Apollo asteroids pass near terrestrial planets, whereas Amor asteroids remain in the same orbit as Jupiter.
D) Apollo asteroids approach the orbit of Mercury, whereas Amor asteroids pass only within the orbit of Earth.