Answer:OD
--sensorimotor stage
Explanation: There are four stages According to Piaget's theory of cognitive development which are Sensorimotor, Preoperational, Symbolic thought and Concrete operational.
The sensorimotor stage is the first stage of a child's development which starts at birth till age 2. This stage is characterized with the child acquiring knowledge by physical activities with his or her environment which develops to developing fine motor skills and the ability to use symbols to create mental representations toward end of the stage.
