Answer:
(C).A solar nebula collapsed. is a correct answer.
Explanation:
The nebula is a cloud of dust and gas occurs in the space.
The solar system was the cloud of gas and dust called solar nebula.
Gravity Collapse of the molecular cloud containing gas and dust led to the start of the fusion reaction and due to gravitational force gas and dust are pulled towards each other, which results in the formation of the solar nebula and the birth of the solar system and star.
The extra mass result into the formation of planets, asteroids, moon and remaining parts of the solar system.
Thus A solar nebula collapsed led to the formation of our solar system.
