you should put on the notices --- all the people may see the

you should put on the notices ___ all the people may see them.Awhere B in which C at D for them,答案是where,能理解,但为什么不能把它作为定语从句来分析呢,notices是先行词,不可以吗,后面从句不缺成分,所以选where做状语---为什么要归结到状语从句呢