The option that best explains the relationship between structure and function of the cell membrane is:
"The lipids and proteins that make up the membrane allow it to be selective about what enters and leaves the cell."
This statement highlights how the unique structure of the cell membrane, composed of a phospholipid bilayer with embedded proteins, contributes to its function. The lipid bilayer creates a semi-permeable barrier, while the proteins facilitate selective transport and communication with the environment, allowing the cell to regulate its internal composition effectively.