C because everything need to be checked and most likely you have certain things that need to be in the writing assignment.
I think the questions that must be ask are:
a.What does “encryption” mean?
d.What are “key distribution problems”?
All the text is based on the concept "encryption" so it is very important to know what it means in order to undestand the rest of the information. If not, you will be missing important facts. In addition, there are a lot of words used that are derived from this one, so you won't be able to undestand them.
Another important concept that gives a lot of information just by knowing it's meaning is "key distribution problems", they could be two or a thousand, it is important to know what they are and what they do.
The other question that seems important is the one of the "public key cryphtography" but this one can be inferred by the context.
One of the characteristics of a character study is (B) getting a glimpse into the character's mind and heart is the most important element of the story.
In a character study, a character's traits and personality are often more important than the plot of the story.
Pretty sure the answer would be C.
