Recently I bought an ancient Chinese vase, was very reasonable． [ ] A． which pri

这是一个非限制性定语从句。根据句意可知指的是花瓶的价格。在定语从句中表示“谁的”，可以这样表达，如：I live in the room whose windows face south．(名词前没有冠词，用whose)＝I live in the room the windows of which face south．(如果名词前有冠词就用of which)。