What does the body use to build maintain and repair cells?

Proteins is used to build and repair cells.

Protein can be found in every living cell and it is very important building block in the body. Protein supply amino acids which were being used to create and repair cells, enzymes, red blood cells, antibodies and tissues. In the body, protein functions by maintaining fluid balance and transportation substances. Protein can be gotten from meat, dairy products, soyabeans, nuts, beans and certain grains.    However, protein from meat and other animal products are known as complete protein.  

i believe the answer is c