I would say C. Plays rely on dialogue and plot to express theme, while poems communicate theme using symbolic details and fresh language.
<span>Poetic devices like imagery and symbolism are ways that poets express themes in their poetry. Poetry often uses symbols from landscape and nature to express theme. </span> One of the simplest ways to express a theme in a play is to use characterization to convey your message. <span>Another way that authors express theme in plays is by the plot, also. </span> Hope I helped! :)