In the Early Solar System, When the Solar System Had

Multiple Choice

In the early Solar System, when the Solar System had yet to be cleared of the debris out of which it formed, which type of object would have been most likely to deposit water onto Earth's surface?

A) a comet
B) an asteroid
C) a Mars-sized protoplanet
D) Both comets and asteroids appear to be sources.
E) None, because water is not a major component of any of the objects above.