France, Russia, and Great Britain formed a military alliance in response to

The Russia Revolution

Japanese imperialism

Ottoman aggression

German unification and Kaiser Wilhelm's diplomacy

The good choice is:

German unification and Kaiser Wilhelm's diplomacy.

Explanation:

The unification of Germany in 1871 put an economic and political giant in the middle of Europe. As German economic might grew and the country became an industrial power, it also wanted to play a larger role in world affaris and launched itself to the race for colonies. Russia, France and Britain formed an alliance to check German power. Germany allied itself with Austria-Hungary. This rigid and threatening system of alliances was one factor that favored the outbreak of World War One in 1914.  

i receive this honor with deep gratitude and great humility. it is an award that speaks to our highest aspirations — that for all the cruelty and hardship of our world, we are not mere prisoners of fate. our actions matter, and can bend history in the direction of justice.

this is a way. : )

can you post options?