The correct option is D. During the last six months of the war, the United States of America, release atomic bombs on two different cities of Japan within a short space of interval. This move was not expected at all by the Japanese and it served as the final stroke that breaks the elephant's back. It leads to quick surrender by the Japanese.
Germany was hit particularly hard during the American Great Depression. The reason being was that America was a major source of loans for Germany's reparations after WW1. When Hitler came to power as the Chancellor of Germany, he incited the entire country into a nationalistic rage and establishing a totalitarian single party state, with the support of the Nazi Party.
None of those it was Constantinople, Bursa, Edirne, and sögüt