Why is the light used in danger signals generally red?

Question

Why is the light used in danger signals generally red? — Exam MCQ

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D. Red is scattered least by fog or smoke — The source's intended explanation is that red light has a longer wavelength and is scattered less than shorter-wavelength visible light.

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A. Red is scattered most in fog or smoke

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B. Red is not scattered in fog or smoke

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C. Red is reflected most in fog or smoke

Why is the light used in danger signals generally red?

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