The Shushtar Historical Hydraulic System, a UNESCO-listed complex of weirs, canals and watermills, dates principally to which empire?

• A The Achaemenid Empire
• B The Seljuk Empire
• C The Sasanian Empire ✓
• D The Safavid Empire

Sasanian engineers — reportedly with captured Roman soldiers — built Shushtar's island canal system in the 3rd century AD.