unemployment and crime are high it can be assumed that the latter is due to the former.

问题补充：

unemployment and crime are high, it can be assumed that the latter is due to the former.

A. Before

B. Where

C. Unless

D. Until

答案：

A. Before

(答案→)B. Where

C. Unless

D. Until

解析：哪儿的失业率高 ,哪儿的犯罪就率高,那可以认为是前者导致后者的原因。