Which of the following is best supported by the pa...

Câu hỏi: Which of the following is best supported by the passage?

A. To effectively control pollution, local government should regularly review their air pollution laws.

B. One of the most important steps in preserving natural lands is to better enforce air pollution laws.

C. Scientists should be consulted in order to establish uniform limits for all air pollutants.

D. Human activities have been effective in reducing air pollution.