The earliest known dam is______________

• A. Jawa Dam
• B. Sadd ‚Äö√Ñ√∂‚àö√ë‚àö¬® el ‚Äö√Ñ√∂‚àö√ë‚àö¬® Kafara Dam
• C. Great Dam of Marib
• D. Roman Dam