Which of the Following Is Not an Example of a Qualitative

Which of the following is not an example of a qualitative difference?

A) For a 6-month-old whose rattle is hidden by a blanket, reality is that the rattle no longer exists.
B) A 3-year-old boy believes that wearing girls' clothes or playing girls' games transforms him temporarily into a girl.
C) A 6-year-old is convinced that a baloney-and-cheese sandwich cut into quarters provides more to eat than when it is cut into halves.
D) For a 6-month-old whose rattle is hidden by a blanket, reality is that it will appear again.