(A) I, II, IV, III
French Revolution (1789) → Napoleon's invasion of Italy (1797) → Vienna Peace Treaty (1815) → Unification of Italy (1859–1870).
The 'Important Dates' box in Chapter 1 gives the exact years: French Revolution precedes 1797 (Napoleon invades Italy), then the Vienna Peace Settlement (1814–15), and finally Unification of Italy (1859–1870). Memorise these key dates to answer chronology-based MCQs quickly.