Which one of the following nutrient improves the immunity of the body against diseases?

The correct option is D Vitamins

Proteins, carbohydrates and fats are macronutrients. The word 'macro' means 'large scale'. These nutrients are required in large quantities and provide our body with energy. Vitamins and minerals are micronutrients. The word 'micro' means 'minute' so micronutrients are required in small quantities by the body. Each vitamin plays an important role in the body and not getting enough of them can cause health problems and diseases.