Final answer:
The correct answer is that dialysis separates dissolved ionic substances and small molecules from colloidal particles. Dialysis involves a semipermeable membrane that allows small solutes to pass while retaining larger colloidal particles.
Step-by-step explanation:
The correct statement concerning dialysis is b. Dissolved ionic substances and small molecules are separated from colloidal particles. Dialysis uses a semipermeable membrane with pores that are large enough to allow water, small solute molecules, and ions to pass through, but not large solute molecules or colloidal particles such as proteins and starch.
For instance, in hemodialysis, a patient's blood is passed through a dialyzer where waste molecules such as urea can pass through the membrane into the dialysate, while red and white blood cells, which are too large, remain in the blood.