Comparison of acids Organic Chemistry

alingy1
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Please look at pictures.
I am wondering for (d). Why is the answer the second one? To which structure in Table 3.1 should I compare it to? I compare the first one to CH3CO2-. What about the second one?
 

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Second one is in the table, no need to look for analogous structure.

That being said, I would not judge which is stronger using the information given. Too close.
 

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