<em>Option </em><em>D. They include subplots</em><em> is not a common element of short stories. </em>
Explanation:
<u>Short stories</u> are pieces of prose writing that can be read in one sitting. These stories are fictional narratives focused on an incident, or a series of linked incidents, that fully develop a theme. As they aim at unity of effect and deal with just a few characters, <u>short stories</u> do not usually include subplots.