Which of the Statements Concerning the Lipid Bilayer of Cell

Which of the statements concerning the lipid bilayer of cell membranes is INCORRECT?

A) The lipid bilayer consists of two identical layers of phospholipids.
B) The hydrophobic hydrocarbon tails are located in the interior of the bilayer.
C) The ionic head groups of lipids are exposed on the exterior surface of the bilayer.
D) The hydrocarbon tails provide a thin shell of nonpolar material that prevents mixing of molecules on both sides of the bilayer.
E) Carbohydrate groups attached to the outer surface of the lipid bilayer participate in receptor and recognition functions.