Final answer:
The main purpose of “Adventurous Storyteller” is to inform readers about Jack London's journey to fame as a writer, detailing his early life, intellectual influences, and literary themes.
Step-by-step explanation:
The author’s main purpose in “Adventurous Storyteller” is to inform about how Jack London became a famous writer. The passage details London’s various life experiences, from his challenging youth, his encounters with vagrancy, and his brief stint at university, to his adventures in the Canadian Yukon and eventual success as a writer. These experiences and his intellectual influences, including the ideas of Friedrich Nietzsche, Charles Darwin, and Karl Marx, shaped his literary works with themes of struggle and naturalism.
London’s life story is presented as an example of how one’s life can influence their creative output, highlighting his development as an author as he evolved from a young reader to America’s first millionaire author.