Answer:
C.) She is actively thinking about and interpreting the results of her actions.
Step-by-step explanation:
Jean Piaget developed the theory of cognitive development. Under this theory, he focused on the way how children acquire knowledge and learning. It also highlights the nature of intelligence. In the above case, Becky can be noticed to acquire the understanding of stacking the blocks. She kept on practicing the activity. This symbolizes Piaget's theory of cognitive development.