D. A child is growing.
I'm growing right now and was curious if I should eat my fill or just enough to make the hunger pains go away. I researched and found that it is better to be in positive energy balance when growing. And by the way, I eat everything in sight and am still skinny as a stick, (which my sisters think is unfair). So I don't think any harm is done if you eat everything while growing a mile tall.