What was a lasting environmental legacy from the progressive era? to settle the debates about how farmers in california or arizona get water for crops to end disagreements over federal actions on dams and national parks to lessen the federal government's role in managing natural resources to expand the federal government's role in managing natural resources

To expand the federal government's role in managing natural resources.

Explanation:

During the Progressive Era, a lot of emphasis was placed in conservation. People believed that it was important to protect natural areas and natural resources from excessive and irresponsible use, which is most likely to happen through private ownership and lack of regulation. Therefore, during these years, the federal government's role was expanded when it came to the   management of natural resources.

answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.