According to the options given, the word that best matches "nimble" is "agile". They are both synonyms and refer to something or someone that is quick in motion. The word that best marches "entreated" is "begged". They are both synonyms and refer to request someone very ernestly and seriously to do something.
The central idea was that people should know what John Wilkes Booth believed and a complete recount of the assassination was provided to them in the form of a book.
