Final answer:
To add a new sheet in Microsoft Excel, click the 'New Sheet' button represented by a plus icon next to the existing sheet tabs or use the shortcut keys Alt + Shift + F1 or Shift + F11.
Step-by-step explanation:
To add sheet to a Microsoft Excel document, Moe should follow the correct procedure, which is not mentioned in the provided options. None of the options a), b), c), or d) accurately describe the standard method for adding a new sheet in Excel. The common way to add a new sheet is by clicking the "New Sheet" button, which is often represented by a plus icon (+) next to the existing sheet tabs at the bottom of the Excel window. Alternatively, Moe can also use the shortcut keys Alt + Shift + F1 or simply Shift + F11 to insert a new sheet immediately.