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？ | 
