Consider the following statements regarding osmotic pressure :

(A) Molar mass of a protein can be determined using osmotic pressure method.

(B) The osmotic pressure is proportional to the molarity.

(C) Reverse osmosis occurs when a pressure larger than osmotic pressure is applied to the concentrated solution side.

(D) Edema occurs due to retention of water in tissue cells as a result of osmosis.

Choose the correct statements with reference to osmotic pressure: