Concept: Piaget's constructivist theory says children actively build knowledge, not passively receive it.
Explanation: Piaget believed knowledge is constructed by the child through exploration and interaction.
Children form mental schemas and adapt them as they experience new situations.
Option A describes behaviourism, which Piaget opposed because it ignores internal mental processes.
Option C represents nativism, which contradicts Piaget's emphasis on active learning.
Option D matches Vygotsky's theory of social co-construction, not Piaget's individual constructivism.
Only option B correctly captures Piaget's core idea: knowledge is actively built by the child.
Answer: B. constructed by the child rather than being passed passively from the environment.