I think it could happen because the girl (don't remember their names sorry) snuck onto the ship where she wasn't supposed to go. Obviously if you do something wrong, no necessarily sneaking onto a spaceship, there are always consequences. The man did try to save her life, but there wasn't much he could do because it was too late for both of them to survive.
True, you want them to understand you as easily as possible and they will not know slang, etc. if they speak little english
Answer: The answer is C. The infinitive "to know" is functioning as an object.
