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Option 3 : C)
The correct answer is option 3.
A has no error as the sentence is in the past perfect tense. So, the word "decided" is used correctly.
B has no error as 'to' is used to indicate the purpose.
C has an error as 'for' is used to indicate the recipient of an action or a reason.
Here, 'of' should be used to indicate the things of which the prices will decrease.
So, option 3 is correct.
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