I'd like to tell you about the table manners __ you should know when you visit Korea.A.which B,who C.what D,how选哪个关系词,为什么

I'd like to tell you about the table manners __ you should know when you visit Korea.A.which B,who C.what D,how选哪个关系词,为什么
I'd like to tell you about the table manners __ you should know when you visit Korea.
A.which B,who C.what D,how
选哪个关系词,为什么

I'd like to tell you about the table manners __ you should know when you visit Korea.A.which B,who C.what D,how选哪个关系词,为什么
A 【you should know 】是一个定语从句,mannners在定语从句中作宾语,原选项中,只有which可以在定语从句中做宾语.
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A which 替代the table manners在从句中做的是know 的宾语。

C， 我想告诉你关于那些你在拜访韩国时需要知道的餐桌礼仪，you should know 你应知道的（什么what） ，是修饰the table manners 的定语从句