Which of the following theorists proposed that children's thinking is qualitatively different from that of adults?

Jean Piaget proposed that children's thinking differs qualitatively—not just quantitatively—from adults' thinking. He argued that children pass through distinct stages of cognitive development, each characterized by qualitatively different ways of understanding the world. Vygotsky emphasized social and cultural influences but did not center qualitative stage differences. Gardner proposed multiple intelligences, and Kohlberg focused on moral development. The qualitative-difference view of cognition is distinctly Piagetian.