The Key to the Ames Room Illusion Is That _____

Multiple Choice

 The key to the Ames Room illusion is that _____.

A) the room is constructed to look rectangular to the observer but it is not
B) the room is constructed of rectangular walls, but does not look that way
C) people of a wide range of physical heights are put in the room
D) all depth cues except binocular disparity are eliminated