Because Russia and the U.S WAS HAVING A TECHNOLOGY RACE
The answer should be B) Bronze age or the second option.
It would be the "Ku Klux Klan" that is considered to be a domestic terrorist group, since they have a long history of intimidating people (especially blacks and Jews) with whom they disagree and degrade.
The answer is, public dissatisfacetion whit the Weimar republic. your welcome. : )