In MS-Excel, a workbook must contain at least _______ worksheet(s).

Correct option is C

In MS Excel, a workbook must contain at least one worksheet. By default, when a new workbook is created, it includes at least one worksheet, but users can add more as needed.
Important Key Points:
1. Minimum Requirement:
· A workbook in Excel cannot exist without at least one worksheet.
· Even if all worksheets are deleted, Excel will retain at least one sheet to prevent an empty workbook.
2. Default Number of Sheets:
· In older versions of Excel (Excel 2003 and earlier), a new workbook defaulted to three worksheets.
· In newer versions (Excel 2013 and later), the default is one worksheet, but users can manually add more.
Knowledge Booster:
· Five: Incorrect, as Excel never required five sheets by default.
· Two: Incorrect, as Excel can function with just one sheet.
· Three: This was the default in older versions but is not a strict requirement.