GMAT Reading Comprehension (RC) | The argument for “monetizing”—or putting a monetary value on—ecosystem

Hi - For the below question, i selected A but the OA was C.

Question : why isnt A the right answer ? The following reason is why i picked "A"

wording in passage " according to David Pearce, that illusion stems from the fact that “services” provided by ecological systems are not traded on the commodities market,and thus have noreadily quantifiable value "..........


Did not like C because counting the international visitors is quantifiable ...hence eliminated C..

In
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