The possible effect of identity theft is "Decreased credit score."
This is because when an identity of a credit card owner is stolen, often the stealer tends to use the information of the credit card owner to borrow more money or buy expensive goods and run away with it.
This often leads to more debt for the original credit card owner.
In turn, having more debt on a single credit card without repayment as at when due leads to "Decreased credit score."
Hence, in this case, it is concluded that the correct answer is option C. "Decreased credit score."
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