Answer: B. It places an emphasis on the necessity to fight for their country.
Step-by-step explanation:
Anaphora refers to repetition of the beginning of a sentence in subsequent sentences in order to emphasize the importance of what is being said.
In this case, Jefferson used anaphora in order to place an emphasis on the necessity to fight for one's country in order to preserve the liberties conferred on them by virtue of being citizens of the country.