Concept:The word "robust" means strong, healthy, and full of vigour.Explanation:In the sentence, "robust" describes children who are strong and healthy.The nearest meaning is "healthy and strong."The other options do not match the exact meaning of "robust.""Pleasant and cheerful" describes personality, "vital and dependable" describes reliability, and "plump and curvy" describes body shape.So the correct choice is option A.Answer:A. healthy and strong