Which of the Following Techniques Have Critics of Piaget's Idea

Multiple Choice

Which of the following techniques have critics of Piaget's idea that object permanence needs time to develop used to support their case that infants are born with "persistence"?

A) They have measured the amount of time that infants spend looking at an event that violates an expectation of object permanence.
B) They have looked to see if an infant will search for an object that is hidden under a piece of cloth.
C) They have measured the age at which infants first show signs of separation anxiety.
D) They have looked at whether infants appear to have strategies for searching for lost objects.