He might have done it to save his people and so that they could fight back after his death and send the people that he sent home during the war to defeat the Persians after his death.
B is the correct answer, also give him brainliest
If you're referring to the militarization and aggression of Germany, there's a lot of debate as to why these nations didn't intervene earlier. The general consensus is that nobody believed Germany would take it as far as they did.