The stage of Piagets Sensorimotor that this represents is the Secondary circular reactions.
This is a stage of repetitive action that takes place in children that are aged 4 to 6 months.
These kinds of actions shows the aim of the child in trying to make things happen. Omar here shakes the car keys repeatedly due to the sounds that he hears.
Read more on the psychologist Piaget here: https://brainly.com/question/3648034