The statement "Eventually, when the price of the phone fell to $300, demand for the product increased and profits began to soar." describes an equilibrium in supply and demand.
This refers to a situation whereby there is a balance in market supply and demand balance which as a result prices become stable.
Because there is a fall in phone price made the demand for the product increased and profits began to soar, this is an example of an equilibrium process.
Therefore, the Option C is correct.
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