请教大全里的一题~！！要考了~请NN帮忙！

wxq19881113

In the years since the city of London imposed strict air-pollution regulations on local industry, the number of bird species seen in and around London has increased dramatically. Similar air-pollution rules should be imposed in other major cities.

Each of the following is an assumption made in the argument above EXCEPT:

(A)In most major cities, air-pollution problems are caused almost entirely by local industry.

(B) Air-pollution regulations on industry have a significant impact on the quality of the air.

(C)The air-pollution problems of other major cities are basically similar to those once suffered by London.

(D) An increase in the number of bird species in and around a city is desirable.（A）

(E)The increased sightings of bird species in and around London reflect an actual increase in the number of species in the area.
这个题我在做的时候思考了很久，我在A和D中间挣扎，，可是最后还是选了D我觉得D像是无关选项。。但是A又有绝对词entirely。。所以很纠结~~请NN们帮忙解读下！