I really need this answered really soon, because its for my exam, can someone please help meee?!?!? What is the function of the bilayer of phospholipid macromolecules within a cell?

a. It allows the cell to fold itself into a double layer when placed in a polar environment.

b. It works together with the endoplasmic reticulum to transport materials through the cell.

c. It produces ribosomes which are the site location of protein synthesis.

d. It elongates the cell creating the stretchy physical characteristic of the cell.