President Hu cut short his visit to Latin America and returned to Beijing on Saturday ______ the 7.1-magnitude quake, ______struck the Tibetan Autonomous Prefecture of Yushu Wednesday morning, and left 1,484 dead with 312 still missing.

President Hu cut short his visit to Latin America and returned to Beijing on Saturday ______ the 7.1-magnitude quake, ______struck the Tibetan Autonomous Prefecture of Yushu Wednesday morning, and left 1,484 dead with 312 still missing.

1. A.
   due to; which
2. B.
   owing to ;that
3. C.
   as to ; when
4. D.
   thanks to; where

President Hu cut short his visit to Latin America and returned to Beijing on Saturday ______ the 7.1-magnitude quake, ______struck the Tibetan Autonomous Prefecture of Yushu Wednesday morning, and left 1,484 dead with 312 still missing.

A. due to; which    B. owing to ;that     C. as to ; when       D. thanks to; where