<span>A) Here is what my mother said to me, at least once: "Jerry, you've got to try a little harder."
Since the quotation from his mother is set off from the rest of the sentence, not continuing it, a colon is appropriate. Additionally, the comma before "at least once" is correct and after "Jerry" is also correct. </span>
C. The sonorous sounds if gentle wind sent him to softly sleep
Allusion.
Both examples come from the Bible. The first comes from the Old Testament and the second from the New. You have to be a little knowledgeable of the Bible to catch on to either one of them (or be good with Google).
A. Brass That´s your answer.