What is the definition of a theme?

the subject of a talk, a piece of writing, a person's thoughts, or an exhibition; a topic.

Explanation:

A theme is a message, moral, or lesson of a story or poem

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D. Kraemer, Ron. “Advancing Without New Resources” Educause Review. March 27, 2015, Web. < http://www.educause.edu/ero/article/advancing-without-new-resources >

Explanation:

Citing sources is an integral part of any academic writing. There are different styles of citing sources, be it the MLA style or the APA style. But depending on the requirement and the preference of each institution or person, the styles may be used accordingly.

But the most common style of citing sources is to mention the last name of the author first, followed by the remaining names. And depending on the source of the work, be it the electronic source or hardcopy, the citing differs. And in this particular case, the correct way of citing the source is

Kraemer, Ron. “Advancing Without New Resources” Educause Review. March 27, 2015, Web. < http://www.educause.edu/ero/article/advancing-without-new-resources >

Thus, the correct answer is option D.