Using the drawing of mRNA below, choose the letter that BEST fits the description. 
The protein-coding region corresponds to region:
Definitions:
Stereoscopic Vision
The ability to perceive depth and three-dimensional structure from visual information captured by both eyes.
Primates
An order of mammals that includes humans, apes, monkeys, and prosimians, characterized by large brains, forward-facing eyes, and opposable thumbs.
Homo Heidelbergensis
Early humans living from about 600,000 to 300,000 years ago; some scientists believe that fossils classified as Homo antecessor should be included in Homo heidelbergensis.
H. Antecessor
An extinct human species or subspecies from the Early Pleistocene of Europe, considered one of the early ancestors of modern humans.
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