Technically, all of these answers are ways to revise your work. I would go with B, Run a spell check and correct errors because it looks like the most accurate way to edit documents.
Shift in line 4 ("but")
Tone is something like humble, questioning...
The correct answer is: [C]:
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" After searching for hours, the lost girl was happily found. "
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The other answer choices are incorrect -- since the other choice have misplaced modifiers, dangling modifiers, and squinter modifiers.
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Hope this helps!
Best wishes to you!
