Answer: B. Create national parks
John Muir was born in Scotland on 1838 and emigrated with his family to the United States when he was 11 years old. He was characterized for being a man who admired nature and fought for its preservation.
During his life, he was in charge of conveying thousands of Americans to keep the natural spaces free of exploitation, and conducted a campaign to ensure the conservation of Yosemite with its declaration as a national park.
He achieved this after publishing his book entitled "Our national parks" in 1901. It is said that the then President Roosevelt, after reading it, wrote to him asking to be guided in a visit to Yosemite, which took place on May 1903.