Correct option is C
In MS Excel 365, pressing F2 puts the active cell into edit mode, allowing you to make changes directly in the cell.
Additional Information:
- Ctrl + F1: Toggles the ribbon display (hides/shows the ribbon).
- F1: Opens the Help menu.
- Ctrl + F2: Opens the Print Preview screen.
Thus, F2 is the shortcut key specifically used for editing the contents of a cell.