In cognitive development, children transition through various stages that characterize their ability to think and reason. According to Jean Piaget, each stage is marked by distinct cognitive abilities and limitations. One specific stage, known as the concrete operational stage, occurs approximately between the ages of 7 and 11 years. During this stage, children begin to grasp the concept of conservation, understand the perspectives of others, and engage in logical reasoning about concrete objects.
Based on Piaget's framework, which of the following exemplifies a child's understanding during the concrete operational stage?