The rate of solid-liquid extraction is limited by the

• A. phase change of the solute as it dissolves in the solvent.
• B. diffusion of the solute through the solvent in the pores to the outside of the particle.
• C. diffusion of the solute from the solution in contact with the particle to the main bulk of the solution.
• D. all 'a', 'b' & 'c'.