What best explains the relationship between structure and function of the cell membrane?

the single layer membrane surrounding the outside of the cell allows for the easy removal of waste.

the lipids and proteins that make up the membrane allow it to be selective about what enters and leaves the cell.

the fluid inside the membrane buffers the chemical reactions taking place inside the cell.

the lipids forming the membrane provide energy for protein synthesis.

i honestly don't have a clue what the answer could be so if you have it explain

The best and most correct answer among the choices provided by your question is the second choice or letter B "The lipids and proteins that make up the membrane allow it to be selective about what enters and leaves the cell."

Phospholipids form the basic structure of a cell membrane, called the lipid bilayer. Scattered in the lipid bilayer are cholesterol molecules, which help to keep the membrane fluid consistent. Membrane proteins are important for transporting substances across the cell membrane.

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And a) oxygen i believe

The answer is nitrogen-containing bases