It is either A or C. i hope i could help. if not im really sorry
A compound. For example, hydrogen and oxygen atoms form water.
The Nebular Hypothesis is the most accepted explanation of the origin of our solar system. It states that the Sun was formed by a massive cloud of dust and gas light-years across, and it was bigger than the actual sun itself. Most of the mass in the center formed the sun, and the rest expanded outward.
