I would say the author means that it would be impossible, or would require tech that today's tech cannot do.
science fiction, or fiction, usually means make believe or fake.
C.The characters' situation at the end is no different than at the beginning.
Language is the center of Yoyo's conflict because it is the thing keeping her from feeling confident presenting a speech in front of her classmates. She is afraid that because of her accent they will make fun of her, so she compares the thought of giving the speech to a "spectre", or a ghost looming over her.