Dissolution is, in fact, affected by all three: stirring, particle size, and temperature.
Stirring ensures solute particles are uniformly mixed throughout the solvent and that solute and solvent particles have ample opportunities to interact with each other, which leads to dissolution.
Compared to smaller particles, larger particles are slow to dissolve in a solvent. This can be observed by dissolving sugar cubes and granular sugar particles in water. With a smaller particle size, there are more chances of interactions between solute and solvent particles, which speeds up the dissolution process.
Temperature is another key variable. At higher temperatures, particles have more kinetic energy and thus move faster, resulting in more collisions between solute and solvent particles, which results in faster dissolution of solute in the solvent.
Thus, among the given options, only option C is correct.
Hope this helps.
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