Alice Is Sitting at the Table with Her Son Nikko

Multiple Choice

Alice is sitting at the table with her son Nikko.She takes his tall glass of milk and pours exactly half of it into a shorter wider glass.Then she says,"Honey,which glass has more milk?" Nikko immediately points to the taller glass.This demonstrates that Nikko has not yet mastered

A) theory of mind.
B) transitivity.
C) object permanence.
D) conservation.