Answer:
Correct answer is: B. The Allies entered Berlin less than one year after
the D-Day (Operation Overlord) invasion.
Step-by-step explanation:
A is not correct as the plan led to the collapse of German forces and at the end to German defeat in war.
B is correct as Operation Overlord started on June 6th 1944, and Allies were in Berlin by May of 1945 when Berlin fell in their hands.
C is not correct because as we have said Berlin was captured in May of 1945.
D is not correct as atomic bombs were used during the attack on Japan.