According to Grammarly and other sources, (such as school lol), a concrete noun is a noun that can be identified through one of the five senses (taste, touch, sight, hearing, or smell). Consider the example below: the noun phone is a concrete noun: you can touch it, see it, hear it, and maybe even smell it or taste it.
I have seen both of these used in short stories heck both have been in the same kind of story, as for B and D they both sound like stories that will be more than just a short story.