"Writer Wallace Stegner said, 'National parks are the best idea we ever had. Absolutely American, absolutely democratic, they reflect us at our best rather than our worst.' By setting aside land for its natural beauty, and not merely for the monetary worth of its resources, we preserve a part of our shared heritage in our land. By making sure historical sites are preserved, we elevate the importance of them, educate our citizens, and ensure that they will remain for generations to come. When these parks are protected so that all people have the ability to visit them--not just the wealthy and well-connected--we underscore the democratic principles of our nation. The staff of the National Parks Service cares for our national parks, and they need resources in order to maintain and protect these special spaces. It is important to safeguard our national parks in order to conserve the natural habitats present there, as well as to preserve the ideals that national parks stand for: natural beauty, citizenship, and democracy." What is the implied main idea?

The staff of the National Parks Service cares for our national parks, and they need resources in order to maintain and protect these special spaces

National parks are American treasures and should remain protected.

Preserving the natural resources in America's national parks is the main reason they should be conserved.

American national parks are either set aside for natural beauty or for their historical significance.