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Bunuel
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I have no idea what A is trying to say and why it is correct..
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I have no idea what A is trying to say and why it is correct..

The way I see it is if you factor in the experts cost, Microprinting tech would be more expensive than Special Ink tech, therefore option A strengthens the answer

Back of the envelope math :

Cost of Microprinting (say $100) + Cost of experts needed to detect counterfeit currency(say $50) > Cost of Special Ink tech (say $120) + Cost of experts needed ($0 - as 'anyone' can detect these c/f currencies)

Punch holes in my explanation

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A is correct because microprinting requires expert analysis to identify the counterfeit bills, however the paragraph states that anyone could easily detect counterfeits if the ink method were used. The implied objection to the ink method was its cost, however, given statement A, if you need an expert to detect counterfeits with method A, the cost of the expert’s time will drive up the cost.

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Difficult question because of the manner in which the correct answer "A" is worded.
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