[求助]大全18-22

22.   In feudal Europe, urban areas developed from clusters of houses where peasants lived and commuted to farmlands in the countryside, unlike homesteading policies in the American West that required residency on the land itself in order to obtain eventual ownership.

(A) In feudal Europe, urban areas developed from clusters of houses where peasants lived and commuted to farmlands in the countryside, unlike homesteading policies in the American West that

(B) In feudal Europe, urban areas developed from clusters of houses where peasants lived and from which they commuted to farmlands in the countryside, but in the American West homesteading policies

(C) Unlike feudal Europe where urban areas developed from clusters of houses where peasants lived and commuted to farmlands in the countryside, the American West’s homesteading policies

(D) Unlike feudal Europe where urban areas developed from clusters of houses where peasants lived and commuted to farmlands in the countryside, the homesteading policies of the American West（B）

(E) Urban areas developed from clusters of houses where peasants lived from which they commuted to farmlands in the countryside in feudal Europe, unlike the American West where homesteading policies

The key is B.

But I don't really see the difference of the choices. Could anyone please explain?

Thank you very much for your help.

I see what you mean, thanks.