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.
Labourer is the synonym of the given problem.
Synonym:
It is one of two or more words or expressions of the same language that have the same or nearly the same meaning in some or all senses.
Labourer:
A laborer (or labourer) is a person who works in manual labor types, especially in the construction and factory industries' workforce. Laborers are in a class of wage-earners in which their only possession of significant material value is their labor.
They are the basic pillar in the country development and have a huge impact over the economy of the nation.
Learn more about Synonym on:
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Option 5/ Option E
Personification
Reason
In a literal sense, Pucks cannot run, but the writer used the phrase ran. Ran is a verb not used for inanimate/ non-living things
Hope that helps
