D is indeed the answer, because 1/ the key word is "25 years" weaken "last 5 years",
2/ and "most biggest film manufacturers using artificial silver" weaken "decline in demand for silver"
A cannot be right because A just gives another fact that does not affect the argument.
C is out of scope, C even contradicts with the argument.
B can never be a correct answer because it is not the reason why the demand falls.
2/ and "most biggest film manufacturers using artificial silver" weaken "decline in demand for silver"
A cannot be right because A just gives another fact that does not affect the argument.
C is out of scope, C even contradicts with the argument.
B can never be a correct answer because it is not the reason why the demand falls.
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