Shortcut key command to Mark Index Entry :AShift + Alt +XBShift + Alt + VCCtrl + Art + XDCtrl + Alt + VAnswer: A. Shift + Alt +X Read Explanation: The correct answer is Shift + Alt + X.In Microsoft Word, pressing Shift + Alt + X (or Alt + Shift + X) opens the Mark Index Entry dialog box, allowing you to quickly select and tag words or phrases to be included in your document's index. Read more in App