The first two steps in the formation of the sun are listed below.

A cloud of gas and dust called nebula spins slowly.
The nebula collapses due to condensation of gases.
Which of these statements best describes the next step in the formation of the sun?
The cloud spins faster as it collapses and flattens into a disk.
The cloud slows down and expands to form a flattened disk.
The nuclear fission of the gas molecules takes place at the center of the disk.
The nuclear particles in the center of the nebula repel each other and move apart.