Refer to the figure below showing a simplified time line of the origin of life. 
Which event could have occurred before the evolution of RNA?
Definitions:
Economic Profits
The surplus remaining after deducting all costs, including opportunity costs, from total revenues, indicating a firm's financial performance beyond breaking even.
Decreasing Returns to Scale
A situation in which, as the scale of production increases, the output increases at a diminishing rate, resulting in reduced efficiency.
Price-Inelastic
Describes a situation where the quantity demanded or supplied changes little when the price changes.
Prisoner's Dilemma
A scenario in game theory where two individuals acting in their own self-interest do not produce the optimal outcome.
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