All of the provided responses are valid in illustrating how genre can affect the theme of a text. However, if you are looking for the most precise answer, it would likely be:
**Genre affects which story elements the author will likely use to present the theme.**
This is because different genres often come with specific conventions and tools that shape how themes are developed and expressed. For example, a romance novel might use emotional dialogue and character relationships to explore themes of love, while in a thriller, themes may be presented through suspenseful action and conflict.