Answer:
D
Step-by-step explanation:
Between 8-10 years old, children are able to mentally combine, separate, order, and transform objects and actions. Their ability to apply logic and reason increases, as does their ability to focus attention. They are able to consider multiple perspectives and apply various thought-out strategies. And while they struggle with understanding abstract or hypothetical concepts, children this age can apply mental operations to concrete problems, objects, and events.