Which of the lettered arrows in the diagram below of translation indicates a codon? 
Definitions:
Oxygen
A chemical element essential for most life forms on Earth, a component of the air and a key element in the respiratory processes of most living organisms.
Nutrients
Substances that provide nourishment essential for the growth and maintenance of life, including carbohydrates, proteins, fats, vitamins, and minerals.
Lake
A lake is a large body of water surrounded by land, usually freshwater but sometimes can be saline.
Monsoon
A seasonal reversing wind accompanied by changes in precipitation, significant in South Asian regions and affecting agriculture and lifestyle.
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