Five-month-old Eric picks up his mother's keys and begins to put them in his mouth
His mother takes the keys away from Eric, and he begins to cry. However, as soon as she puts the keys out of sight behind her back, Eric stops crying and becomes interested in something else. This story demonstrates Eric's lack of
a. conservation.
b. transformation.
c. egocentrism.
d. object permanence.
ANSWER: d
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