What Would Happen If the Plasma Membrane Were Composed Solely

What would happen if the plasma membrane were composed solely of phospholipids and no proteins?

A) All movement of molecules across the membrane would cease.
B) Diffusion and osmosis would continue to occur.
C) Facilitated diffusion, active transport, and osmosis would not occur.
D) The movement of molecules across the membrane would not be affected.
E) Immune reactions would not be affected.