If you click on the Undo button-

The correct answer is It will remove the new text and restore the original text back to your document.

Key Points

• In Microsoft word undo is a option that reverts back to the last change you made in the document.
• Redo is the opposite of undo: it redoes an action you have undone.
• The Redo button is only available right after you've undone something.
• To undo an action press Ctrl+Z.

Additional Information

• Ctrl+C is the shortcut Key to copy a Selected text.
• The Backspace key erases the text to the left of the insertion point one character at a time.
• The Delete key erases the text to the right of the insertion point.