Respuesta :
I think the single sentence that shows it is a personal letter is "that all I can say is that I am well" as the rest of the letter is details about his military campaign so could be part of a more formal memo if it were not for this opening sentence so that seems to be how to identify it as such.
The correct answer for the question that is being presented above is this one: "A. All I can say is that I am well."
Here are the following choices:
A. All I can say is that I am well
B. My position is naturally strong and fortified against an attack from outside.
C. I do not look upon the fall of Vicksburg as in the least doubtful
D.The fall of Vicksburg now will only result in the opening of the Mississippi River and demoralization of the enemy.