When Leroy's mother hides his favorite toy under a blanket, he acts as though it no longer exists and makes no attempt to retrieve it. Leroy is clearly near the beginning of Piaget's stage. concrete operational preoperational formal operational conventional sensorimotor

The correct answer is sensorimotor

Piaget called the stage from birth to 2 years of the child's life as a sensorimotor period or sensorimotor stage.

The human being has a unique cognitive capacity in the world. It is what distinguishes us from other animals, which makes us understand this distinction, which endows us with the ability to communicate, which gives us subsidies to (try) to understand the world.

It is known that the first years of life are fundamental in the development of human beings. This conception started scientifically only in the beginning of the 20th century, with the studies of the child and the infantile behavior. Since then, a series of researches has been established on different aspects of the child's psychic life, his development and the conception of intelligence (and the formation of that intelligence) in the child.

An important development theorist, Jean Piaget, was very concerned with the question of how human beings develop their knowledge about reality, how thought processes happen. His studies have brought about a huge advance in what is now called developmental psychology.