Critical Reasoning

couldnt justify the rationale for the right answer. Pls help.

OA: D

ITS D.

The whole question is to determine how Sulphur dioxide impacts the growth of plants.

If the traffic makes deposits inturn reduces the light . Well light is essential for plant growth. So the whole purpose of the experiment is lost . We are interested in checking whether Sulphur dioxide in Urban area is responsible for reduced Plant growth .

Hope this is helpful.

IMO D.

Arg: how much role sulphur di oxide play in the difference of growth of plants to be proved by the experiment

This can be evaluated in D.

Thanks guys.

My intuition whispers that it is D

I'm going with D, too. No confidence on my answer. Can anyone tell OA?