The detail in "From Barter to Bitcoin" which supports the conclusion that currency can be anything that everyone agrees has value is:
This refers to the use of evidence to back up a claim to prove that it is true based on the context which the claim was used.
With this in mind, we can see that from the complete text, there is a claim used about currency being anything that has value and as such, option A has the detail that things like polished stones, cattle, etc have value and as such can be considered to be currency.
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