Studies Examining a Child's Ability to Lie and Use Deception

Studies examining a child's ability to lie and use deception would most likely be used by developmental researchers to make inferences regarding:

A) the specific age at which object permanence develops.
B) the child's egocentrism and theory of mind.
C) the specific age at which conservation develops.
D) the validity of the concept of a zone of proximal development.