The first three 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.
The cloud spins faster as it collapses.
Which of these statements best describes the next step in the formation of the sun?
The contracting nebula flattens into a disk with a bulge at the center.
The gas particles in the nebula repel each other and move apart.
The nuclear fission of the gas molecules releases large amount of energy.
The sun is created at the outermost portion of the condensed nebula.