An investigator shows a child two equally full beakers of water and then pours one of them into a taller, thinner container. The child says that the taller, thinner container has more water. This observation indicates that the child lacks

A) schemas.
B) the concept of object permanence.
C) the concept of conservation.
D) ego integrity.

This scenario describes Piaget's conservation task, where children are shown that the quantity of a substance remains the same despite changes in its appearance. The child's response indicates that they have not yet developed the concept of conservation, which usually develops around age 7. Schemas (A) refer to mental frameworks for organizing information, object permanence (B) refers to the understanding that objects continue to exist even when they are not visible, and ego integrity (D) refers to a psychosocial stage in Erikson's theory of development for older adults.