To increase the rate of dissolution of a solute in a solution, the best approach would be:
Decrease the particle size of the solute because it would increase how often the solute and solvent particles would collide.
By decreasing the particle size, you increase the surface area of the solute, which allows for more frequent collisions with solvent molecules, facilitating faster dissolution. The other options provided do not effectively describe methods to increase the rate of dissolution in a meaningful way.