Mrs. Pearson cut Judy's hot dog into eight pieces and Sylvia's into six pieces. Sylvia cried because she felt she wasn't getting as much hot dog as Judy. Piaget would say that Sylvia doesn't understand the principle of

A) object permanence.
B) conservation.
C) egocentrism.
D) accommodation.

Conservation

The principle that certain physical characteristics (such as volume, mass, or number) remain unchanged, even when their appearance changes, as understood in cognitive development.

Object Permanence

Object permanence is the understanding that objects continue to exist even when they cannot be seen, heard, or otherwise sensed, a key cognitive development in infancy.

Principle

A fundamental truth, law, doctrine, or motivating force, upon which others are based or from which others are derived.