Progressives challenged how society should view/use nature (conservation movement). the conservationists believed that nature could be used responsibly, but it should also be protected the federal government had no ability to protect any lands free market practice would regulate environmental protection nature should not be used in any way

The correct answer here is the first one. The conservationists believe that nature should be and has to be protected but that it can also be used responsibly by humans. The focus of the Conservationist movement is mainly in the sustainable use of the natural resources. The difference between the conservationists and the environmentalists lies in the fact that the conservationists are interested in protecting the environment expressly so that they can be used by the human race. Some though argue that conservatism is the part of the broader environmental movement but there are those who oppose this viewpoint.