Answer:
The choice that contains the correct punctuation is:
A) Here is what my mother said to me, at least once: "Jerry, you've got to try a little harder."
Step-by-step explanation:
The first option uses correctly the punctuation since it connects the sentences with a comma, colon, and quotation marks, the comma is adding a dependent clause that complements the information of the first clause, then the colon introduces the quotation which has to be open and closed with quotation marks, and of course the fulls top at the end.