Which of the following statements describes the structure of the plasma membrane? a It is a lipid bilayer with the hydrophobic area pointing inward, and the hydrophilic area facing outward.
b Protein molecules make up the membrane, which makes it a strong structure.
c The plasma membrane is made mainly from carbohydrates that give the cell energy.
d It is made primarily of cholesterol that allows the cells to communicate with others.

A. It is a lipid bilayer with the hydrophobic area pointing inward, and the hydrophilic area facing outward.

Explanation:

The plasma membrane (also known as the cell membrane) is a membrane that separates the cell's interior from the environment that surrounds it, protecting it. It consists of lipids, proteins, and carbohydrates.

Its main component are phospholipids that create a bilayer. Phospholipids consist of two hydrophobic tails and a hydrophilic head and are arranged so that the tails face inward and the heads outwards.  

This is why option A is the correct one.

You can see an image of the cell membrane's structure to help you visualize this below: