Which answer matches this clue: the 1993 electoral law named after its rapporteur that replaced proportional representation with a mixed system?

• A Porcellum
• B Italicum
• C Mattarellum ✓
• D Tatarellum

The Mattarellum, named after Sergio Mattarella, was the first major electoral reform after Tangentopoli; it produced clearer parliamentary majorities.