A. Ctr+W
B. Ctr+O
C. Ctr+C
D. None of these

More Important MS Office Shortcut Keys;

MS Office Shortcut Keys To Perform/Description
Ctrl+0 Toggles 6pts of spacing above the paragraph.
Ctrl+A Select all contents of the document/page.
Ctrl+B Bold highlighted selection(text).
Ctrl+D Open the font preferences window.
Ctrl+E Aligns the line or all selected text to the center of the screen.
Ctrl+F Open find box, to search any specific name, text, etc.
Ctrl+I To make selected/highlighted text Italic.
Ctrl+J Aligns the selected text, paragraphs, or line to justify the screen
Ctrl+K To Insert a hyperlink(website address or URL of any website) on selected text/word/line or sentence.
Ctrl+L Aligns the line or selected text to the left of the screen.
Ctrl+M Indent the paragraph.
Ctrl+N Opens a new, blank document window.
Ctrl+O Opens the dialog box or page for selecting a file to open.
Ctrl+P Open the print window.
Ctrl+R Aligns the line or selected text to the right of the screen.
Ctrl+S Save the open document.
Alt+F, A Save the document under a different file name.
Alt+X Show the Unicode code of a highlighted character.
Ctrl+T Create a hanging indent.
Ctrl+U Underline the selected text.
Ctrl+V To Paste the copied text in ms office.
Ctrl+W Close the currently open document.
Ctrl+X Cut selected text.
Ctrl+Y Redo the last action performed.
Ctrl+Z Undo the last action.
Ctrl+Return To Insert the page Break
MS Office Important Shortcut Keys