Final answer:
The plasma membrane is primarily made up of phospholipids, with proteins, cholesterol, and carbohydrates as additional components contributing to its structure and function. Option c.
Step-by-step explanation:
The plasma membrane, also known as the cell membrane, is comprised chiefly of phospholipids. These lipids arrange themselves into a bilayer, forming the fundamental structure of the membrane.
Proteins are also a critical component, embedded within the phospholipid bilayer, and can account for about 50 percent of the membrane's composition by mass in a typical human cell.
While carbohydrates are also present, they are attached to the proteins and lipids on the plasma membrane's external surface, contributing to functions like cell recognition. Cholesterol is another lipid component, contributing to the fluidity and stability of the plasma membrane.
Option c