Question

Which phrase defines a law?

a possible explanation or answer to a scientific question that is based on prior knowledge or research and is testable

A statement of fact that is generally accepted to be true and universal because it has always been observed to be true.

a hypothesis or group of related hypotheses that can be accepted as true based on repeated experimentation with similar results

Answer 1

The second phrase: "A statement of fact that is generally accepted to be true and universal because it has always been observed to be true."

(Briefly: a law describes a consistent natural pattern or relationship; the first describes a hypothesis and the third describes a theory.)