The pilot lost contact with the military base,_______the plane crashed in the desertA) by means of which B)for which C)because of that D)as a result of which 请问选什么?为什么

The pilot lost contact with the military base,_______the plane crashed in the desert
A) by means of which B)for which
C)because of that D)as a result of which
请问选什么?为什么