The water molecules have more kinetic energy and have a greater chance of interacting with (and dissolving) the potassium iodide.
Stirring breaks a solute into smaller pieces which increases its surface area as well as its rate of dissolution. Stirring brings unused portions of the solvent in contact with the solute which allows the solute to dissolve faster.
So we can conclude that option A is the right answer.
Learn more about dissolution here: https://brainly.com/question/4529762