From About 12 to 18 Months, the Infant Is Likely

From about 12 to 18 months, the infant is likely to be able to pass the A not B task, but subtle signs of deep-seated egocentrism might persist. A classic example is:

A) Failure to understand the invisible displacement of an object
B) Temper tantrums
C) Being overly demanding
D) Non-conservation
E) Persistently searching in the same place an object was hidden previously, even though the infant saw the object now being hidden in a different place