Answer: C
Correct answer: Layout
Page margins are set from the Layout tab, called Page Layout in some versions, alongside orientation, paper size, columns, breaks, line numbers and hyphenation. Word offers presets - Normal, Narrow, Moderate and Wide - and a Custom Margins option that opens the Page Setup dialogue for exact values. That dialogue also holds the gutter, extra space added at the binding edge, and Mirror margins, which makes facing pages symmetrical for double-sided printing. Margins can also be dragged directly on the Ruler, where the grey areas at each end represent them - though the dialogue is more precise. Like orientation, margins are a section property, so different margins in different parts of a document require section breaks. Knowing which tab holds which tool is worth a little effort: Home holds fonts and paragraphs, Insert holds objects, and Review holds spelling, comments and track changes.