The correct answer is A) carbohydrates and D) iron.
The nutrients that provide energy for the human body is mainly carbohydrates and iron.
Carbohydrates is the main source of energy for the human body. Always consider carbohydrates in your daily and balanced diet. If you play any kind of sports (football, soccer, basketball) you need the famous "carbs" to provide energy to your body. Carbohydrates contain molecules of hydrogen, oxygen, and carbon. Iron is essential for the correct functions of your body. It is part of the hemoglobin in your blood that transport oxygen from your lungs to the entire body. So with oxygen in your blood and carbohydrates in your system, you will enough energy to make your day.