Two sealed, pyramid-shaped beakers contain what are clearly identical amounts of a liquid. however, a child suddenly judges them as holding different amounts of liquid after one beaker is inverted. the child apparently lacks a concept of

I think the child apparently lacks a concept of  Secure attachment. Secure attachment is classified by children who show some distress when their caregiver will return. Children with secure attachment feel protected by their caregivers, and they know that they can depend on them to return. 

Bidk

D.) domain, kingdom, phylum, class, order, family, genus, species