Why are vitamins essential for our health?

Vitamins are essential for our health because they support various bodily functions vital for overall well-being. Each vitamin has specific roles in the body; for instance, they are involved in processes like immune function, blood clotting, and cell regulation. They act as coenzymes, facilitating biochemical reactions that our bodies need to function properly. Without adequate vitamins, these functions can be hindered, leading to a range of health issues.

While other options touch on important aspects of health, they do not encompass the broad range of functions that vitamins serve. For example, while some vitamins contribute to energy release and digestion, their primary importance lies in the complex roles they play across different bodily systems, making option C the most comprehensive and accurate representation of the necessity of vitamins in our health.