Which answer matches this clue: the historic compromise proposed by communist leader Enrico Berlinguer in the 1970s with the Christian Democrats?

• A Solidarietà nazionale
• B Patto di San Ginesio
• C Compromesso storico ✓
• D Coalizione di pentapartito

The compromesso storico brought the Communists into the parliamentary majority in 1976 but ended with Aldo Moro's murder in 1978.