Which of the following would indicate that a baby has the conceptual category of "motor vehicles"?
O The infant habituates after repeatedly being shown pictures of cars.
O After repeatedly being shown pictures of cars, the infant recovers to a picture of a truck.
O After repeatedly being shown pictures of cars, trucks, and vans, the infant does not recover to a picture of a house.
O The infant prefers pictures of cars that they've ridden in before. After repeatedly being shown pictures of cars, trucks, and vans, the infant recovers to a picture of a house.