What forms the compressions and rarefactions in a sound wave traveling through air?

Question

What forms the compressions and rarefactions in a sound wave traveling through air? — Exam MCQ

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C. Particles in the air bunch together and spread apart alternately — In a longitudinal sound wave, particles oscillate back and forth, alternately forming crowded regions (compressions) and spread-out regions (rarefactions).

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A. Particles in the air permanently collide and stick together

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B. Particles in the air move in a spiral pattern as the wave passes

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D. Particles in the air maintain equal spacing at all times

What forms the compressions and rarefactions in a sound wave traveling through air?

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