Eliska Is Nine Months Old

Multiple Choice

Eliska is nine months old. One of her favourite games is peek-a-boo, and recently she has begun to pry at her mother's fingers when mother covers her face. Eliska has developed _______________, the understanding that mother is still behind her hands even when Eliska can't see her.

A) sensory operations
B) concrete operations
C) conservation
D) object permanence
E) centration