Answer:
Option D. All of the above.
Explanation:
The United States gave much attention to environmental issues in the 1980's and 1990's. Preservation efforts have included:
- Care of endangered species: Approved in September of 1980, The Fish and Wildlife Conservation Act authorized governmental assistance to protect endangered species.
- Maintenance of lands and parks: the Alaska National Interest Lands Conservation Act was passed on November 1980 and aimed to protect national parks across the United States.
- Purification of the air: Clean Air Act Amendments of 1990 that set official standards and regulations for factories, businesses and cars in order to protect the quality of the air.
