After Austria-Hungary declared war on Serbia on July 28, 1914, there was a flurry of activity across Europe. The first, and arguably most important, event happened on the same day. Russia, Serbia's main ally, mobilized its military and prepared to defend Serbia.
Answer:
B
Explanation:
because is the one that has more info
These attackers were known as KamiKazi' They were suicide bombers in planes ready to throw their life away for their country! Hope this helped :)