Sensorimotor stage is described as:

• A. In Piaget's theory, the stage from birth to about 2 years in which infants know the world mostly in terms of their sensory impressions and motor activities
• B. An age where children think mathematically
• C. Stage involving abstract reasoning
• D. Stage where adolescence occurs

Answer: (A)

It describes how infants learn about the world through their senses and their actions. In Piaget's theory, this period lasts from birth to about two years. During this time cognition is grounded in concrete experiences: babies rely on reflexes, then gradually coordinate actions to explore and interact with objects using their senses and motor skills. They don’t think in abstract terms yet; understanding grows through direct engagement with the physical world. Toward the end of this stage they develop object permanence and may begin to use simple symbols, signaling the start of more complex thought. Other descriptions refer to mathematical thinking, abstract reasoning, or adolescence, which are not features of this stage.