Biology

The correct answer is C.proteins.

Proteins are essential for body, cell, and muscle growth and repair. They are made up of amino acids, which are the building blocks needed for building and repairing tissues, including muscles. Proteins also play a crucial role in enzyme function, immune defense, and other physiological processes.

Here’s a breakdown of the other nutrients:

A.Vitamins: Essential for various body functions, such as immune support, energy production, and maintaining healthy skin and vision, but they are not directly involved in muscle or ti...