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

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：where引导地点状语从句，表示在失业率与犯罪率高的地方，犯罪都是由失业引起的。