This figure has rock units and geologic features that are assigned letters that are not in any particular order.From the geologic relations, what is the oldest unit? 
Definitions:
Size Constancy
The perceptual phenomenon where the perceived size of an object remains constant despite changes in its distance from the observer.
Retinal Image
The projection of visual stimuli onto the retina, where light is converted into neural signals sent to the brain.
Approaches
Refers to the different perspectives or methods used in psychology to understand and explain human behavior and mental processes.
Linear Perspective
A technique in art and photography that creates the illusion of depth and distance on a flat surface by converging parallel lines towards a single vanishing point.
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