The Interior of Mercury Contains

The interior of Mercury contains

A) significant amounts of water as permafrost because occasional melting has produced deep water-formed valleys that crisscross the planet's surface.
B) mostly ices and very low-density material because the planet's average density is close to that of water.
C) an iron core that occupies a large fraction of the volume of the overall planet and produces a magnetic field.
D) very little iron, in contrast to Earth, and so the planet has no magnetic field.