2. In the years since the city of LACE>LondonLACE> imposed strict air-pollution regulations on local industry, the number of bird species seen in and around LACE>LondonLACE> 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 LACE>LondonLACE>.
(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 LACE>LondonLACE> reflect an actual increase in the number of species in the area.
why choose A? I choose D.
Thanks for replying. | 
