Refer to the figure of the genetic code shown to answer the following question. Which of the following mutations to a codon is most likely to be selectively neutral? 
Definitions:
Marginal Utility
The additional satisfaction or benefit (utility) gained from consuming one more unit of a good or service.
DVD Players
Electronic devices that play discs produced under both the DVD-Video and DVD-Audio technical standards, used for video and audio playback.
Potential Thieves
Individuals who are considered to have the inclination or possibility to commit theft but have not yet done so.
Calorie Counts
The total number of calories in food, important for dietary planning and nutritional information.
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