Every cell is covered by a membrane that separates the cell from its outside environment. A major component of a cell membrane is its lipid bilayer, which is made of phospholipids. Phospholipids consist of two hydrophobic fatty acids joined by a glycerol molecule to a hydrophilic phosphate group. In the cell membrane, the hydrophilic heads of the phospholipids face outward and the hydrophobic tails face inward.

How does the structure of phospholipids help them perform their function?
A.
It allows them to easily attach to substrates in the outside environment.
B.
It allows them to control the movement of substances into and out of the cell.
C.
It allows them to store energy and release it to the cellular environment.
D.
It allows them to store genetic information that can be used to make cell structures.