In which stage of Piaget's cognitive development do children begin to think logically about concrete events?

The Concrete Operational Stage is the correct answer because this stage, typically occurring between the ages of 7 and 11, marks a significant development in children's cognitive abilities. During this stage, children become capable of thinking logically about concrete events and can perform operations that involve concrete objects. They begin to understand the concept of conservation – the idea that quantity doesn't change even when its shape does.

In this stage, children can organize objects into categories and can understand the relationships between different concepts. For example, they can grasp the idea of reversibility in math (understanding that addition and subtraction are inverse operations) and can solve problems that involve tangible items they can manipulate or visualize.

This cognitive growth lays the foundation for further intellectual development in later stages, particularly as children transition into abstract reasoning abilities seen in the next stage, formal operational, but in the Concrete Operational Stage, logical thinking is rooted in tangible experiences and concrete materials.