Which Function Does the Lipid Bilayer Component of the Plasma

Which function does the lipid bilayer component of the plasma membrane NOT provide for the cell?

A) defines a permeable boundary between the organized interior and the chaotic external environment
B) provides an impermeable, self-sealing membrane that keeps all internal living processes sealed inside
C) controls the exchange of molecules between one cell and adjacent cells or the environment
D) provides a fluid and flexible boundary that insulates the interior from the variations in humidity, food, and other external conditions
E) provides a matrix for proteins that regulate the exchange of molecules between the inside and outside of the cell