The answer to the first blank is C. It is important for a speaker to understand the needs of the audience because it helps the speaker to hone their message for the audience. Understanding the audience will give you the idea of what your audience is like then you can adjust yourself accordingly so that you can approach to them easily and you can be understood by them.
The answer to the second blank is B. Writers should avoid jargon because jargon limits what ideas can be explored. If a writer uses jargons, he wouldn't be able to write much because jargons are easily understood by people and there will be no need of further explanation.
Quote 1: taken from chapter 2:
“And not only did he learn by experience, but instincts long dead became alive again.”
Quote 2: chapter 3 final paragraph
“The dark circle became a dot on the moon-flooded snow as Spitz disappeared from view. Buck stood and looked on, the successful champion, the dominant primordial beast who had made his kill and found it good.”
I think your answer will be D
Answer: I think that is a passive voice
Explanation:
It is in part 8 pages 121-137.
I recommend reading the Alchemist (if you haven't already) because it's truly fascinating.