A theme is a central idea of the subject that focuses on human nature. There can be more than one theme defining a literary piece. Thus, option D is correct.
A theme in literature writing defines the hidden and underlying thoughts and ideas of the writer which they wanted to express through the plot, character, or the setting of the story, novel, play, poem, etc.
A literary piece can have more than one theme as it may help the writer to clearly explain to the readers the idea to be expressed through the story. Common themes like love, revenge, hate, good, evil, coming of age, etc., can be present in a single story.
Therefore there can be multiple themes.
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