<span> Features of the prison camp—including towers, guards, and punishments—made escape difficult, if not impossible. Into Action: Use a chart to record information that may help you </span>identity<span> the article's main idea.</span>
C. Theme
A purpose is the point or intention of the writing piece, it doesn't always tie the writing together. The genre is the type of writing, like fantasy, science fiction etc and the plot is the story/narrative itself. Therefore A, B and D are incorrect.