— Mom,what did the doctor say?— He advised me to live ____the air is fresher

— Mom,what did the doctor say?— He advised me to live ____the air is fresher
A.in where B.in which C.the place where D.where
为什么不能选A,我能不能把它看做是介词引导的宾语从句,为什么必须吧它看做是地点状语从句呢