To Stop Baby Rudy from Repeatedly Reaching for a Sharp

Multiple Choice

To stop baby Rudy from repeatedly reaching for a sharp knife on the kitchen table,Rudy's mother put it in a cabinet and closed the door."Out of sight,out of mind," she thought,and it worked.Rudy's mother capitalized on his lack of:

A) conservation.
B) egocentric thought.
C) object permanence.
D) reversibility.