Planetesimals,asteroid-Size Objects,form During the Early History of the Solar Nebula

Planetesimals,asteroid-size objects,form during the early history of the solar nebula due to ________.

A) collisions of particles of ice,metal,and rocky material rotating about the protosun
B) vortices in the rotating disc associated with the protosun
C) the formation of comets in the outer parts of the solar nebula
D) the break-up of the solar nebula as it cools and contracts

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