Earlier I chose E,
But I think Answer is B. It is no where mentioned that regulations will improve Air quality to get more birds in London.
regulations may lead to removal of certain pollutants which are harmful for birds so birds increased.
But quality of air is not improved significantly.
But I think Answer is B. It is no where mentioned that regulations will improve Air quality to get more birds in London.
regulations may lead to removal of certain pollutants which are harmful for birds so birds increased.
But quality of air is not improved significantly.
