What causes diffraction that results in a fuzzy glow around a full moon?

Diffraction occurs when light bends around small obstacles or particles. Moonlight is sunlight reflected from the Moon; as it passes around particles in Earth’s atmosphere, it spreads out and can create a fuzzy glow. Choice D describes this bending and spreading. Reflection or convergence into a shadow region, as in the other choices, does not explain diffraction.

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