The correct answer is C. Windows.
The Windows key is a key on most Microsoft Windows keyboard layouts, labeled with the Windows logo. It is used to launch the Start menu, open the Quick Access menu, and perform other shortcuts.
The Esc key is used to cancel an operation or close a dialog box.
The Shift key is used to type capital letters and other special characters.
The Shortcut key is a key combination that performs a specific action. For example, the Ctrl+C shortcut copies the selected text.
None of these is not a valid answer.