The major driving force for the formation of a lipid bilayer is _____; once formed the membrane is further stabilized by ________.

A.	electrostatic attractions between phospholipid head groups; hydrophobic forces and hydrogen bonds
B.	hydrophobic forces on the phospholipid fatty acid carbon chains; hydrogen bonds, electrostatic attractions, van der Waals contacts. Yes, hydrophobic forces resulting from the effects on water force the lipids into a bilayer. Once the bilayer forms, hydrogen bonds, electrostatic attractions and van der Waals contacts further stabilize the membrane.
C.	repulsion between negative charges of phospholipid fatty acids; hydrogen bonds and van der Waals contacts
D.	van der Waals contacts between phosphopipid charged groups; hydrophobic forces, hydrogen bonding and electrostatic attractions
E.	electrostatic attractions, hydrogen bonds, van der Waals contacts; covalent bonds