不同意楼上的,D的结构是 句子,插入语,从句...public resource, the courts(插入语),??? (which)in theory are available
由于public resource是宾语,因此which可以省略????
D: some litigants have a preferred status to another in the use of a public resource, the courts, in theory are available to all but in fact are unequally distributed between