C. Both of these
A signal statement tells people that something important is coming so the listener or reader needs to pay close attention. The statement "keep in mind" signals to the reader that what comes next could be an important factor. The second statement "I want you to understand..." also signals to the reader or listener that what will follow is important for the reader to pay attention to.
Answer:
He had mastered the art of healing wounds. The old General of Japan had full faith in his abilities as a surgeon. He did not believe any other doctor. He was not keeping good health and could require a surgery any time, so Sadao was not sent with the troops abroad.
Vindictiveness is one of heroes characteristics if im wrong it might be courage question or good looks