18. The capital of Bosnia-Herzegovina, Sarajevo’s population on the eve of the First World War was 51,919.

(A) Bosnia-Herzegovina, Sarajevo’s population

(B) Bosnia-Herzegovina is Sarajevo, whose population

(C) Bosnia-Herzegovina is Sarajevo, with a population

(D) Bosnia-Herzegovina, Sarajevo having a population that（B）

(E) Bosnia-Herzegovina, the population of Sarajevo

whose, which都可以代物，在用法上有什么分别吗? 这里的whose 可否用which 代？