Singer and Nicolson's Fluid Mosaic Model of the Membrane Proposed

Singer and Nicolson's fluid mosaic model of the membrane proposed that membranes

A) are a phospholipid bilayer.
B) are a phospholipid bilayer between two layers of hydrophilic proteins.
C) are a single layer of phospholipids and proteins.
D) consist of protein molecules embedded in a fluid bilayer of phospholipids.
E) consist of a mosaic of polysaccharides and proteins.