Which of the following is not a key element of a travel narrative? A. motive B. author C. theme D. topic

A topic is your best answer. You need to have a motive to go somewhere. You need to have an author for a narrative and the theme is the biggest part of a travel story.

Well, the theme is where you are which is somewhat important. The motive is very important to traveling. Topic is eh. The author is the writer ... ? I'd say author isn't as important as the motive, theme, or topic. Author or topic would be your answer, and good luck.