At Halloween,Gregory puts on a scary mask that makes him look like a zombie.His three-year-old brother Dennis is petrified,believing that Gregory has become a zombie.Dennis has not yet mastered the concept of
A)classification.
B)conservation.
C)representation.
D)reversibility.

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The Answer of At Halloween,Gregory puts on a scary mask that makes him look like a zombie.His three-year-old brother Dennis is petrified,believing that Gregory has become a zombie.Dennis has not yet mastered the concept of
A)classification.
B)conservation.
C)representation.
D)reversibility.

At Halloween,Gregory Puts on a Scary Mask That Makes Him