The Face/vase Example Illustrates What Important Principle of Perceptual Organization

The face/vase example illustrates what important principle of perceptual organization?

A) If the input is ambiguous,the image can be interpreted in different ways at different times.
B) Illusions do not occur with complex,detailed figures.
C) Faces are easier to see than vases,because of the social aspect of human behavior.
D) The perceiver does not contribute information to an ambiguous image.