Option. A is correct. Credit monitoring service alerts you when there is a change in your credit report.
Credit monitoring refers to staying on top of your credit history by getting notified about any "unusual changes as well as unusual transactions that may have happened through any of your accounts".
According to the question,
The service alerts you when there is a change in your credit report is credit monitoring.
Hence, Credit monitoring service alerts you when there is a change in your credit report.
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