Piaget's theory identifies the preoperational stage as occurring from ages 2 to 7. During this period, children begin to engage in symbolic play and develop language skills, though their thinking remains intuitive and egocentric, lacking the logical operations found in later stages of cognitive development.

Jean Piaget is the most influential figure in developmental psychology regarding stage theories. He proposed that children progress through four distinct, sequential stages of cognitive development—sensorimotor, preoperational, concrete operational, and formal operational—each characterized by qualitative changes in how children think, reason, and understand the world around them.

Mr. Lambers' decision is based on his own internal moral principles, rather than conforming to societal norms, laws, or the fear of punishment. This is a hallmark of Kohlberg's postconventional stage of moral development, where individuals prioritize universal ethical principles and human rights over legal mandates or social expectations, even when those actions carry personal consequences.

Conservation is the cognitive ability to understand that the quantity of a substance remains the same despite changes in its physical appearance or container shape. This ability typically emerges during the concrete operational stage. Children who have not yet reached this stage often focus on a single dimension, such as the height of the liquid, failing to account for the width of the container.

The formal operational stage, beginning around age 12, marks the transition to abstract thought. Adolescents in this stage can manipulate ideas, consider hypothetical scenarios, and engage in deductive reasoning. This cognitive shift allows them to move beyond concrete, observable reality to contemplate complex social, moral, and philosophical issues, which is essential for navigating the broader social environments they encounter during their teenage years.

Jean Piaget is a foundational figure in developmental psychology, best known for his theory of cognitive development. He proposed that children progress through four distinct stages—sensorimotor, preoperational, concrete operational, and formal operational—as they develop the ability to think, reason, and understand the world. His work shifted the focus of developmental psychology toward how children actively construct knowledge through their interactions with the environment.

Object permanence is a fundamental concept in Jean Piaget's theory of cognitive development. It refers to the child's realization that objects exist independently of their perception. Before developing this, infants believe that if an object is hidden, it has ceased to exist entirely.

Conservation is the understanding that the quantity of a substance remains the same despite changes in its shape or appearance. According to Piaget, children in the preoperational stage often lack this ability because they focus on a single dimension, such as height.

Source answer preserved: option B (he did not pay enough attention to the social environment). AI attempted to change protected answer data (option_a, option_b, option_c, option_d), so this item is flagged for manual review before study use.

Kohlberg's conventional level of moral development is characterized by an individual's adherence to social rules, laws, and the expectations of society. Juanita's reasoning is based on the fact that the action is illegal, prioritizing the maintenance of social order and legal compliance over her personal need for pain relief. This alignment with established societal laws is a hallmark of conventional morality.