vice-premier likeqiang shook hands with____scottish first mi

vice-premier likeqiang shook hands with____scottish first minster at the zhongnanshan compound,_____tge central government offices are located.
A visiting,where B visit ,where C visited,which D visiting,which
the answer is A,tell me why ,thanks

visiting是访问的,作scottish first minster的定语；而visit是谓语动词形式,错误；visited的过去分词形式,虽可以做定语,但表示被动和完成意义,错误；第二空前面是表地点的先行词,所以用关系副词where引导非限制性定语从句.