Question

the bodys primary source of energy comes from
carbohydrates
proteins
vitamins
fats

Explanation:

In human physiology (a subfield of Biology, which is part of Natural Science), the body's primary source of energy is carbohydrates. Carbohydrates are broken down into glucose, which is used by cells for energy. Proteins are mainly for growth and repair, vitamins are for various metabolic functions (not primary energy), and fats are a secondary energy source or for storage.

Answer:

A. Carbohydrates