According to Piaget,what Is the Major Accomplishment of the "Beginnings

Multiple Choice

According to Piaget,what is the major accomplishment of the "beginnings of thought" substage of the sensorimotor period?

A) Children understand that a person or object continues to exist even if it cannot be seen.
B) Children are able to show purposeful acts with deliberate variety.
C) Children employ goal-directed behavior.
D) Children exhibit the capacity for mental representation.