Concept:Piaget’s theory says knowledge is actively built by the child through experience, not passively received.
Explanation:Piaget argued that children are not empty vessels.
They explore, interact, and form mental structures called schemas.
When new information does not fit, they adjust their schemas.
This active process is called constructivism.
Option A is wrong because Piaget focused on internal mental changes, not just visible behaviour.
Option C is wrong because knowledge is not innate; it develops through interaction.
Option D describes Vygotsky’s idea of co-construction, not Piaget’s main view.
Thus, the correct choice is B.
Answer:B. constructed by the child rather than being passed passively from the environment.