The Densities of the Four Galilean Satellites of Jupiter Are

The densities of the four Galilean satellites of Jupiter are:

A) all low, typical of rock and ice, because they formed in the outer solar system.
B) very low because, as with Jupiter, they are composed mostly of hydrogen.
C) high (rocky) for the two inner satellites because they formed close to Jupiter, low (rock and ice) for the two outer satellites because they formed farther away from Jupiter.
D) all high, typical of rock, because they are planetary satellites (similar to the Moon) .