MS Excel
Ctrl+ D shortcut key in Excel will

None of the listed here
Apply double underline for the active cell
Open the font dialog box
Fill down in the selection

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MS Excel
When all the numbers between 0 and 100 in a range should be displayed in Red Color, apply

Apply Conditional Formatting command on Format menu
All of above
Select the cells that contain number between 0 and 100 then click Red color on Text Color tool
Use =if() function to format the required numbers red

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