Which five-day autumn festival, the most important annual celebration in West Bengal, involves elaborate pandals housing clay idols of a ten-armed goddess slaying a buffalo demon?

• A Ganesh Chaturthi
• B Navratri
• C Durga Puja ✓
• D Kali Puja

Durga Puja celebrates the goddess Durga's victory over the demon Mahishasura and is the pre-eminent cultural and religious festival of West Bengal.