Answer:
a. 3-month-old infants will gaze longer than 2-month-old infants at an object that has reappeared from behind a screen occluding it.
Step-by-step explanation:
The notion of the permanece of an object is part of a children's process of development. Piagent suggested that the permanence of an object is consolidated between 18 and 24 months. This experiment proved that 3 year olds can realize the presence of an object put it there.