The sentence that best expresses the theme of the passage is "people's actions determine their legacy."
The theme is not an element that can be easily seen in a text, as it is not expressed directly, but subjectively. To identify it, the reader must interpret the text, paying attention to the meaning of each action and thought of the characters and the lessons that can be learned from them.
In the text presented above, we can see that the theme refers to how people should act to ensure success. This is because the narrator says that there will be triumph in battle if he and his friend fight together, that is, two actions are necessary for them to leave a legacy on earth, the action of deciding to fight and the action of doing it together.
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