Which one of the following is not a component of 'realist theory'

Which one of the following is an example of natural monopoly?

Which one of the following represents a progressive tax structure?

Which of the following statements in the context of income-environment relationship is correct?

1.pollution trends tend to follow an inverse U shaped relationship across different stages of economic development

2.In the beginning stage,pollution increases due to urbanization and industrialization

3.In the later stage,pollution declines due to structural changes in the service sector

Select the correct answer using the codes below

Which one of the following is not an example of externalities?

Which one of the following is the major source of Gross Tax Revenue(GTR) for the Government of India?