Answer:
C. The United States maintained strict neutrality with no favoritism.
Step-by-step explanation:
They didn't want to join another war across the world that didn't involve them. Therefore, they stayed neutral and didn't attack. Until of course they attacked Pearl Harbor that sent the US into a motion that couldn't have been stopped by any of the Axis powers. They built and built and built and destroyed and turned to the tide really. It was still equal of course but with the US help it made it a lot better. Then of course the thing that really turned the tide was the nuclear war head that the US sent to Japan. Most people had no doubt that Japan would've kept fighting till there wasn't a single Japanese man in Japan to fight anymore. However, when the US showed that firepower of a nuclear warhead Japan surrendered and it was basically over for the Axis powers.