Which was a cause of world war 1

A The unification of separte german states into one nation

B Austria-Hungarys imperialist ambitions to dominate the balkans

C the invasion of belgium by german troops

D russias desire to stay out of military alliances

1. How did expectations at the beginning of the great war differ from reality?
   

A Fewer countries were going to be involved than people expected

B Fighting was only going to happen on land while people expected naval battles

C Technology was not going to have an impact as people expected it would

D The war was going to last longer then people expected.


Thanks in advance