To answer this question, you need to have knowledge of the different views available in Microsoft FrontPage.
Option A) Folders View - This option is incorrect because Folders View displays the folder structure of your website, not the pages in a tree structure.
Option B) All Files View - This option is incorrect because All Files View displays all the files in your website, not the pages in a tree structure.
Option C) Task View - This option is incorrect because Task View displays the tasks and actions associated with the current page, not the pages in a tree structure.
Option D) Themes View - This option is incorrect because Themes View allows you to choose and apply a theme to your website, not view the pages in a tree structure.
Option E) Navigation View - This option is correct because Navigation View in Microsoft FrontPage allows you to view all the pages in your web site in a tree structure. It provides a hierarchical representation of the pages, allowing you to easily navigate and manage your website's structure.
Therefore, the correct answer is option E) Navigation View. This option is correct because it provides a tree structure view of all the pages in your web site.