The correct answer is D.
John Muir (1838-1914), also known as the Father of the National Parks contributed through his activism to the presevations of US wildlands, such as Yosemite Valley or the Western forests.
He founded the environmental organization Sierra Club. He also wrote many articles and up to 10 books, describing his travelling experiences and enthusiastically promoting echological behaviours and preservation principles.
Answer: he advocated for the preservation of wild lands in the United States- apex
