the centrifugal force created by rapid rotation the electrical repulsion of nuclei in the plasma the gravitational pull created by orbiting planets the outward pressure created by nuclear fusion
I gave my students this multiple choice question: What keeps stars such as the Sun from collapsing from their own self-gravity?

Only one answer is correct among these 4 choices:
- the centrifugal force created by rapid rotation
- the electrical repulsion of nuclei in the plasma
- the gravitational pull created by orbiting planets
- the outward pressure created by nuclear fusion

Could you tell me which one is correct?

the outward pressure created by nuclear fusion