Which of the Following Is an Example of a Child

Multiple Choice

Which of the following is an example of a child using a mental operation?

A) believing that a taller, narrower glass has more water than a shorter, water glass after watching the water poured from one to the other
B) children engaging in collective monologues
C) arranging a stamp collection according to country of origin
D) children having difficulty taking a listener's knowledge into account when communicating