Option 1: Fats are an important source of energy in the body. When broken down, fats produce a larger amount of energy compared to other nutrients. Therefore, fats do provide energy.

Option 2: Proteins are not primarily used as a source of energy in the body. However, in certain situations (such as during prolonged exercise or when insufficient carbohydrates are available), proteins can be broken down and converted into energy. So, proteins can provide energy to some extent.

Option 3: Vitamins do not provide any energy directly. They are essential for various bodily functions but do not contribute to energy production.

Option 4: Carbohydrates are the body`s main source of energy. They are broken down into glucose, which is then used by cells for energy production. Therefore, carbohydrates do provide energy.

In summary, the correct answer is option 3 - vitamins do not provide any energy.