Choose the complete sentences

Maryam and Lan/ been/ pen pals/ over two years.

• A. 
  Maryam and Lan had been pen pals over two years.
• B. 
  Maryam and Lan have been pen pals for over two years.
• C. 
  Maryam and Lan haven’t been pen pals over two years.
• D. 
  Maryam and Lan have been pen pals since over two years.