A. Bus boycotts in Montgomery, Alabama
D. Ratificación of the 13th, 14th, 15th amendments
The Hungarian revolution began in budapest
I believe it's asking you how many votes you need to get the majority. example: in a presidential election, more than 50% is the majority.
The immediate result of trench warfare was that combatants on both sides were largely shielded from small arms and artillery fire, which prolonged the fighting and the war.