In the Ames Room,people Are Seen to Get Smaller or Larger

In the Ames room,people are seen to get smaller or larger as they move about.What does this demonstrate about our perception

A)  The proximal stimulus is unrelated to the distal stimulus. 
B)  The actual distal stimuli are the primary determinants of perception. 
C)  Perception depends on the assumptions we make about stimuli. 
D)  Bottom-up processing controls most perception.