A file in MS Excel is known as a:

In Microsoft Excel, the primary file type is known as a Workbook. A workbook serves as a container for one or more individual worksheets, allowing users to organize and manage related data within a single file. This structure is fundamental to how Excel operates, enabling complex data analysis and presentation.

• Document (A) is incorrect because this term typically refers to files created in word processing software like MS Word.
• Slide (B) is incorrect as it refers to individual pages within a presentation program like MS PowerPoint.
• Worksheet (D) is incorrect because while a worksheet is a core component of Excel, it is only one sheet within the larger workbook file, not the file itself.