Among the choices, "b. the importance of militarism and war" is not a common theme of authors writing dystopian literature. Actually, one of the topics of some dystopian authors is the potential threats of those.
Here are the common themes in dystopian literature:
Thus, a. the importance of free will and individuality, c. the importance of a shared, liberated humanity, and d. the importance of knowledge and truth are all common themes of authors writing dystopian literature.
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