Why are Venus and Earth so similar in composition? A.They both formed inside the frostline at roughly similar distance to the Sun B.They formed from the same planetessimal that broke apart following a big impact C.They both suffered similar comet impacts during the late heavy bombardment D.They are the same size, so they attracted (and were able to hold on to) the same building blocks E.They both formed at the same time from the same collpasing cloud Solution Why are Venus and Earth so similar in composition? The strong reason for this is They are the same size, so they attracted (and were able to hold on to) the same building blocks .