Concept:Computers manage and store data in the form of files, which are the basic units of storage.Explanation:Files are used to store all kinds of data, such as text, images, and programs.Folders and directories are not storage units themselves; they are used to organize and group files.Documents are only one specific type of file, not the general form of stored data.Therefore, the correct storage unit for data on a computer is a file.Answer:B. files