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In a research, it is proved that in old age one should take more quantity of proteins in diet than any other group of food. Which of the following justifies this?

A)  Proteins help to repair and build muscles. In old age, muscle growth increases, hence protein intake should be more.

B)      Proteins help to repair and build muscles. In old age, muscles become weak, hence protein intake should be more.

C)      Proteins give energy to the body. In old age, the body needs more energy to work, hence protein intake should be more.

D)      Proteins give energy to the body. In old age, the body uses stored fat hence, protein intake should be more.