The correct option is (c) scattering of light. When sunlight enters the atmosphere, fine particles like dust and gases scatter the light in all directions. This scattering makes the sky appear blue and causes reddish sunsets.
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The correct answer is: (c) scattering of light. When sunlight enters the atmosphere, it meets tiny particles like dust and gas molecules. These particles scatter the light in all directions, rather than just letting it pass straight. This phenomenon is called scattering of light, which is also why the sky looks blue during the day.