Assume That We Discover a New Moon of Jupiter

Multiple Choice

Assume that we discover a new moon of Jupiter.It orbits Jupiter at a large distance and in the opposite direction that Jupiter rotates.It is much smaller than most of Jupiter's other moons
And has a density close to that of Earth rocks.Therefore, this moon is most likely

A) a regular moon that formed with Jupiter in the early Solar System.
B) an irregular moon that is most likely a captured asteroid.
C) an irregular moon that is most likely a captured comet.
D) an irregular moon that is most likely a protoplanet that collided with Jupiter in the early Solar System and then was caught in orbit by Jupiter's gravity.
E) More information is needed before any conclusion can be made.