Most Comet Nuclei Are Believed to Be

Multiple Choice

Most comet nuclei are believed to be

A) chunks of rock or iron chipped from asteroids by impacts.
B) large carbon chondrite meteoroids that have been set on fire by the Sun and are trailing long smoke trails.
C) chunks of water and methane ice ejected from the surface of the icy satellites of the outer planets by asteroid impacts.
D) chunks of dirty ice left over from the formation of the solar system.