The answer can be more than one choice
which of these storylines can be categorized as science fiction?
a.a man tries to trace his birth parents and learn more about his family.
b.a narrator describes her experiences traveling to a distant planet.
c.a passenger recounts his voyage on board the titanic and how he survived its sinking.
d.a woman invents a machine that allows her to pass through solid objects.

The answers are B and D: A narrator describes her experiences traveling to a distant planet; a woman invents a machine that allows her to pass through solid objects.

Science fiction is a literary genre that explores fictional inventions and technology in conjunction with social scenarios of a utopian or dystopian nature proposing, more often than not in an implied manner, a critique of actual and current situations and scenarios and their impact on today´s society. The works of Kurt Vonnegut, the 20th century American writer, are a good example of this.

the story line that can be categorized as a science fiction would be: b.A narrator describes her experiences traveling to a distant planet. and d.A woman invents a machine that allows her to pass through solid objects. In science fiction genre, is thatalways include a scientifc findings that still haven't exist in reader's world. For example: Time travel, ballte space shift, light saber, etc)

It means bicycle were invented in the military