The correct answer is: B. Bookmark
A bookmark is a stored link to a Web page, in order to have a quick and easy access to it later. Bookmarks can be saved in a variety of ways, including in a web browser, on a computer, or on a mobile device.
A WP-Link is a type of WordPress plugin that allows users to create and manage bookmarks. A field is a data element in a database or spreadsheet. Length is a measurement of distance or duration. None of these are stored links to a Web page.