Answer:
A. They have large cities.
Explanation:
Major reasons for high levels of air pollution in developing countries such as China and India are:
- The pollution from vehicles is poorly regulated. This means most of the vehicles on road do not conform to acceptable or permissible level of pollution.
- The Pollution by industry is poorly regulated. This means the industries are non compliant to permissible air pollution guidelines and many do not adhere to it. This also points towards poor implementation of pollution laws by the government.
- Poor people use wood and dung to cook and heat homes. This is due to lack of education and awareness among the poor and also owing to lack of resources available to them.