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 figure and the background are ambiguous, the image can be interpreted in multiple ways.
B) The mind interprets depth, even when none is depicted in the image.
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.