Which statement best describes the relationship between a hypothesis and a theory?

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In science, a hypothesis is a testable statement about how something works. A theory is a well-supported, broad explanation that ties together many observations and experiments and has withstood extensive testing. When a hypothesis is repeatedly tested and consistently supported by robust evidence, it contributes to the development of a theory and can become part of that explanatory framework. That’s why this description fits best: a hypothesis becomes a theory after it is tested and well-supported. The other ideas don’t fit because theories aren’t mere guesses, and hypotheses and theories are related parts of how science explains the natural world.