Final answer:
C. Water is one of the 6 essential nutrients needed by the body for various functions and is critical for maintaining good health and hydration.
Step-by-step explanation:
One of the 6 nutrients your body needs is water. Water is essential to life because biochemical reactions take place in water, and it is involved in various functions within the human body such as being a transportation vehicle for nutrients, serving as a medium for chemical reactions, acting as a lubricant and shock absorber, and regulating body temperature. Unlike other nutrients which are derived from food, water is typically consumed directly and is crucial for maintaining hydration and overall health.