hypothesis. theory. law. fact.
I gave my students this multiple choice question: An idea that the universe originated with an explosion is supported by repeated observations of light from distant galaxies traveling away from Earth. An idea that has been tested repeatedly and is supported by repeated results is most likely a

Only one answer is correct among these 4 choices:
- hypothesis.
- theory.
- law.
- fact.

Could you tell me which one is correct?

theory.