Young Matthew Is Playing with His Mother

Multiple Choice

Young Matthew is playing with his mother. She has his favorite stuffed animal, and she suddenly hides it under his blanket. Instead of looking for it under the blanket, Matthew starts to cry a little, since he thinks his toy is gone. Matthew's tears suggest that he has not yet developed

A) ​conservation.
B) ​reversibility.
C) ​transitory properties.
D) ​object permanence.