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Revise the following:
Whether started by an overturned lamp and by matches, the fire was dreadful and deadly.
A. Not only started by an overturned lamp and by matches, the fire was dreadful and deadly.
B. Whether started by an overturned lamp or by matches, the fire was dreadful and deadly.
C. The fire was dreadful and deadly whether started by an overturned lamp and by matches.
What is "B. Whether started by an overturned lamp or by matches, the fire was dreadful and deadly."