Question

the swiss scholar jean piaget made groundbreaking contributions to the study of ______ development.
physical
social
emotional
cognitive

Explanation:

Jean Piaget is renowned for his theory of cognitive development. His work focuses on how children's thinking and understanding (cognition) evolve over time. Physical development pertains to bodily growth, social development is about interactions with others, and emotional development is related to feelings. Piaget's main contribution was in cognitive processes.

Answer:

cognitive