Which of the following nutrients gives more energy per gram?

Both carbohydrates and fats are known as energy-giving foods. 

A major part of our daily diet includes carbohydrates, whereas fats are consumed in small amounts. However, fats provide more energy compared to the same amount of carbohydrates.

Empirical values suggest that one gram of carbohydrate yields 4 kcal of energy, while one gram of fats yields 9 kcal of energy.

Thus, fats give more energy per gram.