Multiple Choice, Single Answer (Core)

Read the text and answer the question.

Marlene opened her hydro bill and found it almost triple the usual amount. She called Riverside Hydro to ask why. The representative explained that a meter reader had misread her unit number last month and applied her usage to a neighbouring account, while her neighbour's lower reading was applied to her file. The company confirmed the error after checking the meter serial numbers on both properties. They corrected the charges on her account and issued a credit for the difference, which would appear on her next statement. Marlene was told no further action was needed on her part, since the mix-up was on their end.