Correct Answer:
C. C) Book1
Document 1: This is the default name for Word documents, not Excel spreadsheets.
Workbook 1: While technically accurate, "Workbook" isn't the standard default file extension used by Excel.
Worksheet: This refers to a single sheet within a workbook, not the entire workbook itself.
Modern versions of Excel typically use Book1.xlsx as the default filename. The ".xlsx" extension signifies the file format, which is the default for newer Excel files.