All of the options provided are examples of themes. However, if you are looking for a statement that is more of a moral or lesson rather than a broad theme, then "Good will triumph over evil" could be considered less of a theme compared to the more nuanced ideas presented in the other options.
In literary terms, themes tend to be deeper concepts that can involve multiple interpretations, while "Good will triumph over evil" might be seen as a more straightforward moral lesson. However, all are valid themes in literature.
If you must choose one that might be less abstractly thematic, it would be:
Good will triumph over evil.