How do carbohydrates generally benefit living organisms?

Carbohydrates primarily benefit living organisms by supplying energy. They serve as a major source of fuel for cellular processes. When carbohydrates are consumed, they are broken down into glucose, which is a simple sugar that can be readily used by cells for energy. This energy is essential for various biological functions, including muscle contractions, nerve impulses, and maintaining body temperature.

Additionally, carbohydrates can be stored in the form of glycogen in animals and starch in plants, providing a reserve of energy that can be mobilized when needed. This ability to store and release energy is crucial for maintaining the energy balance in living organisms, ensuring they have an adequate supply for activities and metabolic processes.

While carbohydrates do play roles in other areas, such as being structural components in certain organisms, their primary and most critical role is in energy supply, making option C the most accurate choice in this context.