Myra is writing a research paper about how Mark Twain's personal life influenced his writing. Which of the following are secondary sources that she could use for evidence in her paper?

If the option stated in the comments are the correct ones, it could be said that the one which might be used as evidence in her paper might be option D (the novel Life on the Mississippi by Mark Twain) because it is about his dream of becoming a steamboat captain and he received his pilot license in 1859. It also mentioned the only two places he considered home which were Hannibal and the Mississippi River.