key to Display the Style dialog box
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ALT+ #
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ALT+ $
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ALT+' (apostrophe)
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ALT+" (quotation mark)
C
Correct answer
Explanation
ALT+' (apostrophe) opens the Style dialog box in Excel, where you can apply, create, or modify cell styles. The apostrophe key is used because it's related to formatting and styles. This is different from the Format Cells dialog (CTRL+1).