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 the EarthEarth, whereas Amor asteroids cross the orbit of Mars but not the EarthEarth''s orbit.
B) Apollo asteroids orbit entirely inside the EarthEarth''s orbit and therefore do not cross it, whereas Amor asteroids cross Earth''s orbit and therefore might hit the EarthEarth.
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.