Question

this nutrient is important for making hormones, muscles, and many cell structures. carbohydrate protein water fat

Explanation:

Proteins are essential for making hormones, building and repairing muscles, and are components of many cell - structures. Carbohydrates are mainly an energy source. Water is crucial for various bodily functions but not a building block for hormones and muscles in the same way. Fats are important for energy storage and some hormone - related functions but not as directly involved in muscle and cell - structure formation as proteins.

Answer:

B. protein