Answer:
bilayer
Explanation:
The plasma membrane is SEMIpermeable, it can allow certain materials like nonpolar molecules to pass though its membrane so choice A is wrong. Choice B is also wrong because the plasma membrane is a phospholipd bilayer, meaning it has proteins. Choce C isn't correct because cholesterol is not composing most of the membrane.
Choice E is your best answer because the most important function of the plasma membrane is to control what enters and exits the cell.
Hope this helps and makes sense to you! Good luck.
