In which stage of Piaget's theory do children begin to understand their senses?

The correct choice is the Sensorimotor Stage, which is the first stage in Piaget's theory of cognitive development. This stage spans from birth to approximately 2 years of age, during which infants learn about their environment primarily through their senses and motor actions.

During the Sensorimotor Stage, children actively explore their surroundings and gain knowledge through experiences related to touch, taste, sight, sound, and movement. They begin to understand the world around them by interacting with objects, manipulating them, and experiencing the consequences of their actions. For instance, infants learn that shaking a rattle makes a sound, which helps them make connections between their actions and the world.

This stage is essential because it lays the foundation for further cognitive development. After this stage, children move on to the Pre-operational Stage, where symbolic thinking and language development become more prominent, but the foundational understanding based on their sensory experiences primarily occurs in the Sensorimotor Stage.