Concept:In spreadsheet software, deleting a worksheet removes it permanently from the workbook.
Explanation:When a worksheet is deleted from a workbook, it is discarded directly from the file structure of that workbook.
It does not get transferred to the operating system's Recycle Bin or Trash.
The Recycle Bin stores files deleted from folders on the computer, not objects removed from inside an application.
The deleted worksheet is also not sent back to its original folder and is not stored permanently in main memory.
After the deletion is confirmed, the worksheet cannot be restored from any normal location.
Therefore, the worksheet is considered lost forever unless a backup copy was made earlier.
Answer:A. lost forever