Answer: The answer is B. Particle size of the solvent
Explanation: Solvent is usually in a liquid state (or sometimes in gaseous or solid-state). It is used in dissolving solutes (which are usually in solid-state). Although, the solute can also be in the form of a liquid and gaseous state.
When a solute dissolves in a solvent, a solution is formed. An example is when you have a salt (solute) dissolved in water(solvent) it will form a saline solution( which of course is the solution).
Factors that determine the rate a solute dissolves in a solvent include; temperature, stirring, the particle size of solute, the quantity of solute.
Temperature affects the rate of dissolving because, in a warmer solvent, solute has more energy to move compared in a cool solvent.
Stirring helps in the distribution of a solute in a solvent. When u agitate or stir, the solute will dissolve faster in the solvent.
The particle size of solute affects the rate of dissolving because a smaller particle size of a solute will dissolve faster than a solute with larger particle size.
Quantity of solute can also be a factor because when you have different quantities of solutes in a particular quantity of the same solvent, the rate of dissolving will be different provided they undergo the same factors I.e the solute with higher quantity will dissolve slower compared to the solute with less quantity provided the solvent is in the same temperature state.
Since solvents are usually in a liquid state, the particle size of the solvents won't be a factor of the rate at which the solutes will dissolve.