Which historical experiment involving Compton scattering significantly contributed to the development of quantum mechanics by demonstrating the particle nature of light?

The Compton effect shows that X‑ray photons collide with electrons and change direction and energy, just like tiny balls. Other options are incorrect because The double‑slit experiment reveals interference patterns that come from waves overlapping, not from photons bouncing off; The photoelectric effect proves light can eject electrons, showing photons have energy, but it does not involve scattering of photons.