Which answer matches this clue: the centuries-long debate among writers and scholars about which dialect should become the national standard?

• A Riforma ortografica
• B Purismo linguistico
• C Questione della lingua ✓
• D Neolingua

The Questione della lingua was argued by Dante, Machiavelli, and Bembo; it was settled practically when Manzoni rewrote I Promessi Sposi in Florentine.