(C) (a)-IV, (b)-II, (c)-III, (d)-I
Victor Emmanuel II was proclaimed king of unified Italy; Mazzini founded Young Italy Movement; Garibaldi conquered Kingdom of the Two Sicilies; Cavour was Chief Minister.
The source passage clearly states: Cavour "led the movement to unify" as Chief Minister; Mazzini founded "Young Italy in Marseilles"; Garibaldi "marched into South Italy and the Kingdom of the Two Sicilies"; and "Victor Emmanuel II was proclaimed king of united Italy." Match these directly to the roles given.