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.
C. They restore it to its former beauty.
Answer:
The underlined group of words that is a participial phrase is:
O living in organized cities
Explanation:
One can recognize a participial phrase in a sentence because it looks like a verb, but it actually functions as an adjective. Its purpose is to modify a noun in the same sentence. For example, "living in organized cities" is a participial phrase that spices up or further describes "the people of this area." Phrases like this modify a noun and provide added description about the action of the noun or its description.
Answer:
Good for you :)
(Ignore this part it asked for 20 characters)
