In order to be able to answer this, we'd need to know what book it is you're reading, as well as the answer choices as the question asks "which of the following best" meaning that they want you to choose the best answer from the choices they’re giving you.
Eliza tried humming it before she tried to sing the song.
Answer:
Jonas is finally giving something back to The Giver—the courage to act. Jonas and The Giver hatch a plan: Jonas will escape from the community, so that all of his memories will return to the people of the community.
It is they were nurses, also fighter.
Answer:
Research questions not only are important, they are fundamental for scientific research. The main reason is that a research question provides (or at least should provide) a viable way to investigate a complex scientific problem. For example, the problem of understanding the human mind has so many aspects and is so complex that you cannot hope to solve it without transforming it in so many research questions of much less scope than the original problem.