You are going to read a text about air pollution in the National Capital Region. Some sentences are missing from the text. Choose from the list (A-C) the most appropriate sentences to complete the text. There is also an extra sentence that you do not need to use.

The National Capital Region’s public health emergency arising from a significant deterioration in air quality over the last fortnight has finally forced governments in the region to seriously explore a coordinated effort to deal with the crisis. This development is good. 1) ___________ Research on the sources of air pollution show that NCR needs a permanent coordination mechanism to deal with the perennial major source of pollution: vehicular emission. 2) ___________

A. The recent spike in pollutants may have a lot to do with the advent of crop burning in Punjab, Haryana and Uttar Pradesh

B. However, given India’s experience in dealing with emergencies, there is the risk of state effort waning once the air quality improves.

C. This is perhaps the most important and toughest challenge to overcome.