What role do carbohydrates play in the body?

Carbohydrates play a crucial role in the body primarily by providing energy. They are one of the body's main sources of fuel, especially for the brain and muscles during physical activity. When carbohydrates are consumed, they are broken down into glucose, which is then used by the cells to produce energy. This energy is vital for the body's various functions, including muscle contraction, metabolic processes, and maintaining overall bodily function.

While carbohydrates are essential for energy, other nutrients fulfill the roles of building up tissue, enhancing immunity, and assisting in digestion. Proteins, for instance, are primarily responsible for tissue repair and growth, while vitamins, minerals, and certain types of fibers can enhance immunity and aid in digestion, respectively. Therefore, the primary function of carbohydrates is energy provision, solidifying the correctness of the chosen answer.