The correct answer is D. A concrete example is one that provides a clear situation in which the abstract idea, in this case the author's argument, is exemplified. This option not only prepares the reader for the example, but also gives specific details about what could be regulated.
The A because visited is a action verb
Revise her prediction. if she doesn’t, she won’t be able to focus on the fact that it is about camels, not the army.
Answer: The best answer for this question would be your last option:
A poem is timeless, while a story is tied to a particular place and time.
Hope this helps!