what aids dissolution because it spreads out and disperses a solute more evenly? stirring or agitation mass…

Brief Explanations:

Stirring or agitation helps in spreading the solute particles more evenly throughout the solvent, increasing the contact between solute and solvent molecules and thus aiding dissolution. The mass of the solute just affects the amount present, pressure mainly affects gas - liquid dissolution (Henry's law), and temperature affects the solubility but not in the way of spreading the solute evenly as described in the question.

Answer:

stirring or agitation