What is the name of the ancient Persian system of gently sloped underground channels used to transport water from aquifers to the surface in arid regions, recognized by UNESCO as a masterpiece of human ingenuity?

• A Qanat ✓
• B Yakhchal
• C Badgir
• D Ab-anbar

Some qanats in Iran stretch for many kilometers and are thousands of years old, still providing water today.