According to Piaget, which cognitive stage includes children roughly aged 7-11?

The correct identification of the cognitive stage that includes children roughly aged 7 to 11 is the Concrete operational stage. During this stage, children begin to think logically about concrete events. They gain a better understanding of the concept of conservation, which involves recognizing that quantity doesn't change even when its shape does. This is when children start to engage in logical reasoning and develop the ability to classify objects into different sets and to understand the perspective of others.

In contrast to the other stages, the Concrete operational stage is characterized by the development of organized thinking and the ability to perform operations in a way that is logical and systematic, but still tied to concrete objects. This contrasts with the Formal operational stage, which takes place later (from about age 11 onward) and involves abstract and hypothetical thinking. The Preoperational stage (ages 2-7) is marked by egocentrism and a lack of understanding conservation and the Sensorimotor stage (birth to about age 2) focuses on experiencing the world through senses and actions. Thus, the Concrete operational stage is unique in its features, marking a critical development in children's reasoning capabilities.