It Is Rare to See Jupiter's Galilean Satellites Occult One

It is rare to see Jupiter's Galilean satellites occult one another. Why is such an event seen only rarely?

A) The satellites are very small and move very rapidly, so the occultation happens very quickly and it is easy to miss.
B) The orbits of these satellites are in different planes, so the satellites themselves are rarely along our line of sight at the same time.
C) The orbits of these satellites all lie very nearly in the same plane, but Earth only occasionally crosses this plane.
D) The occultations occur most often when the satellites are on the far side of Jupiter, not visible from Earth.