What Is the Primary Difference Between Infant Abilities During the Fourth

Multiple Choice

What is the primary difference between infant abilities during the fourth and fifth substages of the sensorimotor period?

A) An infant in the fifth substage is capable of symbolic thought.
B) The substage 5 infant acts to achieve goals.
C) The substage 5 infant deliberately varies her behaviour to create new schemes.
D) An infant in the fifth substage can search systematically for hidden objects.