Answer: A. Stage four
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.