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In Piaget's theory of cognitive development, the stage known as "concrete operational" is a critical phase where children typically aged 7 to 11 begin to think logically about concrete events. At this stage, they develop the ability to perform operations on objects that are physically present, which means they can understand the concept of conservation (the idea that quantity remains the same despite changes in shape or appearance) and can classify objects based on several features. This cognitive development allows them to solve problems in a more logical manner compared to the earlier "preoperational" stage, where thinking is more intuitive and egocentric.
The other options represent theories from different developmental psychologists. "Trust vs. mistrust" is a stage from Erik Erikson's psychosocial development theory focused on infants' needs for trust in their caregivers. "Generativity vs. stagnation" is another Erikson stage pertaining to middle adulthood, where individuals focus on contributing to society and helping the next generation. "Oral" relates to Sigmund Freud's psychosexual development stages, specifically during infancy where gratification is centered around the mouth. Each of these theories addresses different aspects of human development, but only the "concrete operational" stage is a part of Piaget's cognitive developmental