Answer:
D) Xander has not yet attained object permanence.
Step-by-step explanation:
Object permanence is the perception that objects remain even though they can't be seen, used, touched, smelled or perceived in some way.
Xandra is still young, he isn't able to recognize different objects yet, 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.
Usually, object permanence tends to grow between 4-7 months of age and includes a baby's perception that when things go down, they're not gone forever. Once the baby understands this idea, things are gone, absolutely gone, which ruin his vision.