What are vitamins essential for?

Vitamins play a crucial role in regulating metabolic processes and supporting growth, which makes option B the correct answer. They are organic compounds that the body requires in small amounts to function effectively. Each vitamin serves specific functions that contribute to various physiological processes, such as immune function, energy production, and the synthesis of hormones and enzymes.

For example, certain B vitamins are vital for energy metabolism, while vitamin D is important for bone growth and immune function. By supporting these vital functions, vitamins ensure the body operates optimally and can effectively grow and develop.

The other choices do not accurately reflect the primary roles of vitamins in the body. While they are involved in processes related to energy metabolism or detoxification, they do not directly provide energy, store fats for energy use, or primarily function as detoxifiers. Instead, these roles are carried out by other nutrients, such as carbohydrates and certain organ systems.