Xander is a 5-month old who is intrigued by a fancy rattle. When his caretaker takes the rattle away, he begins looking at the kitchen light in
the background and does not seem to look for the rattle. Which of the following is true of this scenario?

A. Xander is in the preoperational stage of development
B. Xander has developed a sense of egocentrism
C. Xander is clearly in the concrete operations stage
D. Xander has not yet attained object permanence