The use of the pronoun "we" in the final sentence of the excerpt; unites Kennedy with the everyday Americans to whom he is speaking.
<h3>Plural Pronouns</h3>
From the excerpt, it follows that the speech was addressed to the citizens which indicates All Americans.
The last sentence reads thus; In the last 24 hours, we had their answer.
The use of the first person plural pronoun, we indicates that Kennedy was referring to himself and the everyday Americans as used in the context.
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Based on this fact, it can be inferred that "<span>c. Writing the riddles down was important to him" since he was so engaged with his writing that he didn't care about the cold. </span>
A) varied
Varied/variety means there's many, which is said in the next sentence.