Which of the following bases has a conjugate acid with the largest pKa? 
Definitions:
Alternative Foregone
The next best choice available to someone who has made a decision, also known as the opportunity cost.
Opportunity Costs
The financial downside to eschewing the next top alternative in the spectrum of choices.
Marginal Costs
Marginal costs refer to the additional cost incurred from producing one more unit of a good or service.
Microeconomics
The branch of economics that studies the behavior of individuals and firms in making decisions on the allocation of limited resources.
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