Rank the following compounds in order of decreasing acidity, starting with the most acidic. 
Definitions:
Put Option
A financial contract giving the holder the right but not the obligation to sell a specified amount of an underlying asset at a set price within a specified time.
Exercise
The action of implementing or executing a right or option, such as the act of buying or selling an asset under the terms of an options contract.
Option Strike Price
The strike price is the set price at which an option contract can be bought or sold when it is exercised.
Option Contract
A financial derivative that gives the buyer the right, but not the obligation, to buy or sell an underlying asset at a set price within a specific period.
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