In which stage of cognitive development do children typically begin to develop class inclusion skills?

The Concrete Operational Stage is the correct answer because, during this phase of cognitive development, which typically occurs between the ages of 7 and 11, children begin to think logically about concrete events. They start mastering the concept of class inclusion, which is the ability to understand that a particular category can encompass various items or groups that share common characteristics. For example, a child in this stage can recognize that a group of dogs is also part of a larger group of animals, demonstrating a more sophisticated understanding of relationships between classes of objects.

In contrast, the Preoperational Stage, which occurs from approximately ages 2 to 7, is characterized by symbolic thinking but lacks the logical reasoning that allows children to understand class inclusion. They may struggle with tasks that involve hierarchical relationships between categories.

The Formal Operational Stage begins around age 12 and features advanced reasoning and abstract thinking. While children in this stage can tackle problems involving class inclusion, the foundational skills for this concept are developed earlier in the Concrete Operational Stage.

The Sensory Motor Stage, occurring from birth to about age 2, focuses on the development of sensory perception and motor skills, with no capacity for understanding class inclusion or other complex cognitive operations. Thus, the understanding of class inclusion as part of cognitive