According to Piaget's theory of cognitive development, during which stage do children typically develop the ability to think logically about concrete events but struggle with abstract concepts?

Understand the characteristics of each stage: Sensorimotor (birth to 2 years) involves sensory experiences and motor actions; Preoperational (2 to 7 years) involves symbolic thinking but limited logical reasoning; Concrete Operational (7 to 11 years) involves logical thinking about concrete events but struggles with abstract ideas; Formal Operational (12 years and up) involves abstract and hypothetical thinking.

Match the description in the question to the stage where children think logically about concrete events but struggle with abstract concepts, which corresponds to the Concrete Operational stage.