If the Moon in Its Orbit Around Earth Moves Alternately

If the Moon in its orbit around Earth moves alternately between Earth and the Sun and behind Earth from the Sun, why do observers not see solar and lunar eclipses every month?

A) The Moon's motion in its orbit is so slow that it reaches eclipse position only once every 6 months.
B) The Moon's orbital plane is slightly inclined to the ecliptic.
C) The Moon's orbital plane is at right angles to the ecliptic.
D) The Moon's orbital plane is inclined slightly to the celestial equator, which is the path of the Sun across the sky.