Consider the structures given below. 
Fill in the blanks with appropriate letter (A,B,C,D,E,F).
-Structure__________________ would produce a solution near pH 7.
Definitions:
Call Option
A financial contract giving the buyer the right, but not the obligation, to buy a specified amount of an underlying asset at a predetermined price within a specified time frame.
At The Money
A situation in options trading where the strike price of an option is equal to the market price of the underlying asset.
Out Of The Money
Describes an options contract that would not yield a profit if exercised at the current market level.
In The Money
Describes an option with an intrinsic value where a call option's strike price is below the market price of the underlying asset or a put option's strike price is above.
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