Which of the labeled hydrogen atoms in the following structure is the most acidic? 
Definitions:
Law of Diminishing Returns
An economic principle stating that as investment in a particular area increases, the rate of profit from that investment, after a certain point, cannot continue to increase if other inputs remain at a constant.
Marginal Study Time
The additional amount of time spent studying beyond the current level, focusing on the impact on overall academic performance.
Sunk Cost
Past expenses that have already been incurred and cannot be recovered or altered.
Nonrefundable Ticket
A type of ticket purchase that cannot be returned for a refund. These tickets generally offer a cost advantage but less flexibility.
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