Answer: B
Correct answer: a spelling correction
The Insert tab adds objects to a document: tables, pictures, shapes, charts, SmartArt, headers, footers, page numbers, text boxes, symbols, equations, hyperlinks and cross-references. A spelling correction is not an object and is not inserted. Spelling is handled from the Review tab, or by right-clicking a word marked with a wavy red underline. Knowing which tab holds which tool is worth a little effort, since examinations test it directly. Home holds the clipboard, fonts, paragraphs and styles. Insert holds objects. Design holds themes and page backgrounds. Layout holds margins, orientation, columns and breaks. References holds the table of contents, footnotes, citations and the index. Mailings holds mail merge. Review holds spelling, thesaurus, comments and track changes. View holds the document views, the ruler and the Navigation pane.