B. It reminds readers that they each have a personal interest in America’s success in the war.
It says "You" a bunch of times, and "you are devoted by the enemy to plunder and destruction" by " Howe, the chief of plunderers" (which was their enemy at the time".
This means that, because they do not want to be plundered & that they can gain things if the revolution is successful, they will want to support the cause & fight for the rebellion.
hope this helps