WHICH OF THE FOLLOWING IS BEST SUPPORTED BY THE PASSAGE

Câu 56. Which of the following is best supported by the passage?

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

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

C Human activities have been effective in reducing air pollution.

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