Correct Answer:
C. Ctrl + C
The keyboard shortcut used to copy selected text is Ctrl + C. This command duplicates the selected content and places it onto the clipboard, allowing it to be pasted elsewhere without removing it from its original location. Ctrl + X is used to 'cut' selected text, removing it from its original location and placing it on the clipboard. Ctrl + V is used to 'paste' content from the clipboard. Ctrl + Z is the universal shortcut for 'undoing' the last action. Thus, Ctrl + C is the correct shortcut for copying.