The most appropriate limitation of George's crayon model of the solar system is:
A. The model cannot show that the planets differ in size.
This is because a drawing typically cannot accurately represent the vast differences in size between the planets, especially when scaling them to fit on a standard sheet of paper. Option B is incorrect because he can still place the planets in the correct order; option C, while valid in a certain context, is less significant than size; and option D is also irrelevant since the drawing doesn’t represent actual movement in space.