According to the Behistun Inscription, Darius I seized the throne after killing which magus who had usurped it?

• A Bardiya's vizier Prexaspes
• B Oebares
• C Gaumata ✓
• D Intaphernes

Darius claimed the magus Gaumata had impersonated Bardiya, son of Cyrus, and usurped the throne in 522 BC.