Question: How did the terrestrial planets in the inner solar system form? Need Assignment Help? A) The rocky planets formed from dust grains that built up into planetesimals and finally collided together to form planets. B) The rocky planets formed multiple coronal mass ejections and the solar wind. C) The rocky planets are hot Jupiters with atmospheres that have been removed over time. D) The rocky planets are captured from other solar systems and help prove the solar nebula theory.