The rate of solid$-$liquid extraction is limited by the

Phase change of the solute as it dissolves in the solvent

Diffusion of the solute through the solvent in the pores to the outside of the particle

Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution

All $\text{'}$a$\text{'},\text{'}$b$\text{'}$ & $\text{'}$c$\text{'}$