Why do we need to consume balanced diet​

Nutrition is vital for your body and all of its systems to function properly, by having good nutrition it will help you maintain a healthy weight, reduce body fat, provide your body with energy, promote good sleep and generally make you feel better. This has been proven through many scientific studies and is now well documented. By having good nutrition it has been proven that you are less likely to develop many of the present-day diseases.

I'd probably say d as you would try to reassure them that everything would be ok and that they won't come to any harm.