The correct answer is A. Hyperlink.
A hyperlink is a word, phrase, or image that, when clicked, takes the user to another web page or part of a web page. Hyperlinks are often underlined and blue, but they can also be other colors and fonts.
A menu is a list of options that a user can select from. Menus are often found in operating systems, software programs, and websites.
A source drive is a physical drive that contains data. Source drives can be internal hard drives, external hard drives, or USB drives.
None of these options is a good description of underlined text.