Answer:
The right answer is D: realize that the term heavy describes an object one way and the term big describes it another way.
Explanation:
The studies of Piaget suggested that when a child is born, his brain if of a very basic kind of structure. He did not agree with the idea that intelligence is a pre-determined trait and in contrast he said that during the process of child's growth and development, when the interaction with environment occurs, his cognitive abilities also grow.
When the child is able to realize that term heavy describes an object one way and the term big describes it another way, that is the point when , children have acquired the cognitive skill of conservation.
Hope it help!
