The correct answer is answer choice A
The battle of Vicksburg cut off many supplies for the Confederate army and the battle of Gettysburg killed so many of Confederate troops that he could no longer attempt an attack on Union soil.
I remember taking this test if a choice is to (ensure consistent quality standards) then that is the answer if not sorry.
The correct answer would be alternative A) "France."
In 1942, World War II was happening, and Nazi Germany was the main force of the Axis, one of the two major military alliances of the time.
Alternatives B and C are located East of Germany, thus being disqualified as answers to this question.
By 1942, Nazi Germany was fighting a two-front war. One front in the Soviet Union, and the other in France.