To combat persistent counterfeiting, Lackland's currency was redesigne

To combat persistent counterfeiting, Lackland's currency was redesigned to include images that cannot be convincingly duplicated by the means used to successfully counterfeit the old bills. Last year, after the old currency was replaced, many crude counterfeits of the new bills were detected. But now it has been several months since any counterfeit currency has been found. Therefore, it is clear that counterfeiters have largely abandoned their attempt to reproduce the new currency, always assuming that _______.

Which of the following most logically completes the argument?


A. none of the old currency is still in use in Lackland Incorrect

already know old currency was replaced by new currency

B. there are no other currencies that can be convincingly duplicated using the old techniques Incorrect

argument is talk about only Lackland's currency, other currencies are irrelevant

C. they have no adopted new counterfeiting techniques Correct

possible choice - that is the reason counterfeiters abandoned their attempt to reproduce the new currency

D. the penalties for counterfeiting have not increased Incorrect

irrelevant

E. Lackland's currency is worth more than when the new bills were first introduced Incorrect

not related with last line