Which Child Has Acquired Perceptual Size Constancy

Which child has acquired perceptual size constancy?

A) Raven, who looks out a window on a plane and realizes that people in the terminal look like ants but that they are actually much bigger.
B) Robin, who knows that she will get bigger when she is older
C) Jay, who can perceive the difference in size between a one-story building and a 10-story building
D) Loon, who uses Lego building blocks to create a tower that is taller than he is