Final answer:
The author's purpose is to inform the reader about the superior wilderness in the U.S.
Step-by-step explanation:
The author's purpose in writing this selection is 4) To inform the reader that the U.S. has the best wilderness. The author wants to provide information about the U.S. wilderness and highlight its superiority. This can be seen through descriptions of the beauty and richness of the Ten Thousand Islands and the author's emphasis on the unmatched wilderness found in the United States.