You are writing an email to your landlord to report a broken heater. Which opening is most appropriate for B1 level?
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A
Dear Mr Brown, I am writing to let you know that the heater in my flat is not working.
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B
Hey, the heater's broken, can you fix it ASAP.
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C
To Whom It May Concern, I hereby wish to formally notify you of a defect.
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D
Hi! Hope you're well! Quick thing โ heater broken lol.