Which of the following nutrients primarily provides energy to the body?

Carbohydrates are the primary source of energy for the body. They are broken down into glucose, which is then utilized by the body's cells for immediate energy or stored for future use in the form of glycogen. This makes them essential for fueling various bodily functions and physical activity.

In contrast, minerals are essential for various bodily functions, including bone health and enzyme activity, but they do not provide energy directly. Vitamins are important for metabolic processes and play vital roles in maintaining health, but similarly, they do not supply energy. Water is crucial for maintaining hydration and supporting biological processes, but it also does not contribute calories or energy. Thus, carbohydrates distinctly serve as the main energy source among the given options.