Your first preference is to spend Saturday studying for an upcoming test, while your second choice is to spend Saturday with your friends. Choosing to study means the lost opportunity of time with your friends. Which of the six core principles of the economic way of thinking does this illustrate?

A) People Gain When There is Voluntary Trade

B) Economic Systems Influence Choices and Incentives

C) All Choices Involve Costs

D) People Respond in Predictable Ways to Incentives

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