------the emperor saw was quite different from------- the ol

答案：D
翻译：皇帝所看到的一切和老大臣告诉他的一切完全不一样.
all在此题中为代词,意思是“所有的/一切的（人/物）”,相当于名词.
而后面的the emperor saw和the old minister told him都是定语从句,修饰all.
这两个定语从句的关系代词都是that,都代替先行词all在定语从句中分别充当saw和told的宾语,所以这两个that都可以省略.
即：(that) the emperor saw = the emperor saw (that) = the emperor saw (all)
(that) the old minister told him = the old minister told him (that) = the old minister told him (all)