Which faith, historically rooted in the Volga-Ural region and the North Caucasus, is the second-largest religion in the country by adherent count?

• A Buddhism
• B Judaism
• C Islam ✓
• D Shamanism

Islam was established among the Volga Bulgars by the 10th century; Tatarstan and Bashkortostan in the Volga-Urals, and Chechnya, Dagestan, and Ingushetia in the Caucasus are traditional centres.