D
定语从句,that做live in的宾语.
live是不及物动词,表示“住在那里”必须加介词 in
.where he lives = .which he lives in = .in which he lives = .that he lives in .
大致就是这样,这三个词具体的用法,还是建议你看一下语法说,会详细很多.