Which best describes heating by radiation?

Which best describes heating by radiation?
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I need to know this answer. Here is the question; Which bestdescribes heating by radiation? A. Air molecules touch the warmground, heating them up. B. Warm air rises and takes heat with it;eventually it cools and sinks. C. Sunlight travels through spacewithout the aids of fluids or solids. D. Air at the equator risesand sinks at the poles. Please tell me which one is correct.
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