(D)

This is typically an assumption X question

I would negate the options and then check whether it is weakening or not.If it is weakening,then it is an assumption and so it is not required.

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

air-pollution problems are not caused almost entirely by local industry
So??
Is there any need to impose strict pollution regulation??NO
so this is a correct assumption.And not correct answer

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

Air-pollution regulations on industry is not having a significant impact on the quality of the air.


But is quality of air in any way to deal with birds population??

In real world it might be but yes there is no information regarding this, so this option least affects the argument.

So this is the correct answer.

[c]The air-pollution problems of other major cities are basically similar to those once suffered by London

no need to say this.....

Similar air-pollution rules should be imposed in other major cities.

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

that's why we are imposing regulations, isn't it??
So valid assumption

E) The increased sightings of bird species in and around London reflect an actual increase in the number of species in the area.

Quiet a Valid assumption


Hope this helps.
I think this question is from CR bible(I don't remember it although)

gmat740 wrote:This is typically an assumption X question

I would negate the options and then check whether it is weakening or not.If it is weakening,then it is an assumption and so it is not required.

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

air-pollution problems are not caused almost entirely by local industry
So??
Is there any need to impose strict pollution regulation??NO
so this is a correct assumption.And not correct answer

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

Air-pollution regulations on industry is not having a significant impact on the quality of the air.


But is quality of air in any way to deal with birds population??

In real world it might be but yes there is no information regarding this, so this option least affects the argument.

So this is the correct answer.

[c]The air-pollution problems of other major cities are basically similar to those once suffered by London

no need to say this.....

Similar air-pollution rules should be imposed in other major cities.

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

that's why we are imposing regulations, isn't it??
So valid assumption

E) The increased sightings of bird species in and around London reflect an actual increase in the number of species in the area.

Quiet a Valid assumption


Hope this helps.
I think this question is from CR bible(I don't remember it although)

IMO D

Air-pollution regulations on industry is having a significant impact on the quality of the air.

If the quality of air is impacted by industries then it make sense to implement the regulations.

Increase in the bird population is just an outcome due to the implementation of regulations.

It needs not to be an assumption!

Please share your thoughts!

shud be A

Every other choice seems to be an assumption
but in A, the words "almost entirely" are alarming.

Please provide the OA

Hey guys...sorry for the late reply..OA is A..

Every other choice seems to be an assumption
but in A, the words "almost entirely" are alarming.

Thanks for correcting me.

gmat740 wrote:

Every other choice seems to be an assumption
but in A, the words "almost entirely" are alarming.

Thanks for correcting me.

Sorry guys for bringing this post up again!

I still don't understand the reason why OA is A.

My reasoning:

Premise: 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

Conclusion: Similar air-pollution rules should be imposed in other major cities.

Air - pollution in London was due to the pollution of Local Industry and ban helps london to reduce the air - pollution. hence , similiar bans should be implemented in other major cities.

NOw as per option A:

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

Option A states that major pollution caused by Local Industry

and NOW if negate it i.e air-pollution problems are NOT caused almost entirely by local industry then it means even if we implement the SAME bans there would not be any positive effect as the source of pollution is different. In turn it weakens the argument.

Please share your thoughts!

Thanks heaps!

I believe the answer should be A