Was it in 2002 __________ he was still at middle school __________ the boy became expert at computer?

Was it in 2002 __________ he was still at middle school __________ the boy became expert at computer?

Was it in 2002 __________ he was still at middle school __________ the boy became expert at computer?

Was it in 2002 __________ he was still at middle school __________ the boy became expert at computer?

1. A.
   that; where
2. B.
   when; where
3. C.
   that; when
4. D.
   when; that

Was it in 2002 __________ he was still at middle school __________ the boy became expert at computer?
  A. that; where  B. when; where  C. that; when  D. when; that