Answer: D) A government website on space exploration.
Explanation: nonfiction is a kind of writing that is about real events and facts, rather than stories that have been invented. From the given options, the only one that represents an example of a nonfiction source, is the corresponding to option D: A government website on space exploration, because it presents information based on facts and things that really happen, which would help the author to make the elements in his story realistic.
There's no way of getting around death as a theme of Love in the Time of Cholera. The title itself refers to a highly infectious disease that was often fatal to those who contracted it.