Living in the country has its advantages,____ freedom from pollution is the best.A.for what B.whose C.of which D.from that为什么选C,不是B?

Living in the country has its advantages,____ freedom from pollution is the best.A.for what B.whose C.of which D.from that为什么选C,不是B?
Living in the country has its advantages,____ freedom from pollution is the best.
A.for what B.whose C.of which D.from that
为什么选C,不是B?

Living in the country has its advantages,____ freedom from pollution is the best.A.for what B.whose C.of which D.from that为什么选C,不是B?
C.of which 中的of 表示部分与整体的关系,which 指代advantages.
of which freedom ...=of the advantages freedom ...其中的一个好处是...
如用whose ,那么whose freedom 则相当于the advantages' freedom ..."好处的自由" 讲不通.因此只能选C不能选B.
句意:生活在农村有它的好处,其中,没有污染就是最大的好处.

that不能用来引导非限制性定语从句，并且from和that很少有这个搭配引导从句