Answer: https://www.shmoop.com/historical-texts/hope-despair-memory/
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The story strongly suggest themes of human relationship and (possibly) a heist or job that seems to be involved.
Throughout the novel Voltaire employs the element of setting to signify the importance of distorted societal values. Candide grows up in beautiful castle in Westphalia; he is a young man of suspicious birth. Voltaire begins with this setting so he can expose the warped values that are related to social status.
The correct answers would be "using contractions, slang terms, and colloquial expressions" and "using expressive punctuation". This way the writer brings the topic closer to the reader by making it "sound more like conversation". If you use "formal rules of grammar", it does not sound like a conversation, and "underlining words for emphasis" only draws your attention to those words. Mentioning your friend in the letter doesn't really affect anything.