Concept:Evidence of the particle nature of matter includes phenomena caused by the movement or existence of discrete particles, not wave behaviour.
Explanation:Diffusion and Brownian motion both clearly show that matter is made of tiny, moving particles.
Diffraction, however, is a behaviour of waves, not particles.
It occurs when a wave bends around an obstacle or passes through a narrow opening.
Therefore, diffraction does not support the idea that matter is particulate.
Esterification is a chemical reaction involving particles, but it is not a standard evidence of the particulate nature of matter.
So the concept that is not evidence of the particle nature of matter is diffraction.
Answer:C. Diffraction