The correct answers are B) A narrator recounts the day his hometown suffered an alien invasion and D) A teacher takes her class to the past in a time machine to investigate their roots.
The two storylines that can be correctly categorized as science fiction are A narrator recounts the day his hometown suffered an alien invasion and a teacher takes her class to the past in a time machine to investigate their roots.
We can define science fiction or "sci-fi" as a literary genre of fiction, non-real but based on science possibilities. The characters, plots, situations, machines, or devices can be based on scientific probabilities or future discoveries. For instance, space travel to other planets with humanoids living there or in another galaxy is part of science fiction.
