Which answer matches this clue: the 1950s opera world rivalry that divided fans into Tebaldiani and Callasiani?

• A Freni-Scotto rivalry
• B Sutherland-Caballé rivalry
• C Tebaldi-Callas rivalry ✓
• D Nilsson-Price rivalry

The rivalry between Renata Tebaldi and Maria Callas was amplified by the press; Callas once said comparing them was like comparing champagne to Coca-Cola.