Which theory outlines cognitive development in distinct stages such as sensorimotor, pre-operational, concrete operational, and formal operational?

• A. Freudian Psychosexual Theory
• B. Erikson's Psychosocial Development
• C. Vygotsky's Sociocultural Theory
• D. Piaget's Theory of Cognitive Development

Answer: (D)

Stage-based progression of children's thinking is being described here. Piaget's Theory of Cognitive Development outlines cognitive growth in four distinct stages—sensorimotor, pre-operational, concrete operational, and formal operational. In the sensorimotor stage, babies learn through direct interaction with the world and develop object permanence, the understanding that objects still exist even when not immediately seen. The pre-operational stage brings language and symbolic play but also egocentrism and trouble with taking others' perspectives. The concrete operational stage introduces logical reasoning about concrete objects, an understanding of conservation, and the ability to consider multiple aspects of a situation. The formal operational stage opens the possibility for abstract and hypothetical thinking, as well as systematic problem solving. This framework is specific to Piaget and differs from Freudian psychosexual stages, Erikson's psychosocial crises, or Vygotsky's emphasis on social context and cultural tools, which do not map onto this same sequence of cognitive milestones.