Adriana and her mother have been playing patty-cake, but mother is now trying to engage Adriana in a picture book. Adriana wants to play patty-cake again, so she grabs mother's hands and puts them together as if in a clap. Adriana is clearly in which stage of sensorimotor development? A. stage four B. stage one C. stage two D. stage three

Explanation: When it comes to sensorimotor development, that is, cognitive development of infants, scientist Piaget has suggested that there are six sub-stages. What Adriana did is talk about the sensorimotor abilities of infants from 8 to 12 months of age. It is a stage in which the infant can, in addition to mimicking certain reactions and movements, coordinate movements and reactions in order to achieve a specific goal. So it begins to be oriented toward a specific goal, not only repeating the movements seen, but coordinating and taking the initiative to reach the desired goal.