Explanation:

- Microsoft Word: A widely used word processor developed by Microsoft. It allows you to create, format, and edit text documents.

- Word Perfect: Another word processor, popular in the 1980s and 90s. It is known for powerful formatting options and is used for creating various documents.

- Microsoft Excel: This is a spreadsheet program, not a word processor. It is used for data calculation, graphing tools, and pivot tables.

- Word Star: An early word processor, popular in the late 1970s and early 1980s. Used for writing and editing documents.

Correct Answer: Microsoft Excel