In which stage of Piaget's Cognitive Development do children begin to engage in symbolic play but do not yet understand concrete logic?

The Preoperational stage is characterized by the development of language and symbolic thinking, allowing children to engage in imaginative and symbolic play. This stage typically occurs roughly between the ages of 2 and 7 years. During this time, children begin to use words and images to represent objects and experiences, which is reflected in their playful activities and storytelling. However, they still struggle with understanding concrete logic and the concept of conservation, which refers to the understanding that quantity doesn't change even when its shape does.

In contrast, the Sensorimotor stage, occurring from birth to about 2 years old, focuses on developing skills through sensory experiences and motor actions, without symbolic thinking. The Concrete Operational stage, following the Preoperational stage and occurring from about 7 to 11 years of age, marks the beginning of logical reasoning and the ability to perform operations on concrete objects. Finally, the Formal Operational stage, which starts around age 12, involves advanced abstract reasoning and problem-solving skills. Thus, the essence of the Preoperational stage lies in symbolic play and imaginative thought without the grasp of concrete logic, making it the correct answer.