Why was the role of moderate parties decisive for Weimar democracy?

Correct answer: They supported the constitutional republic amid extreme oppositions

The direct answer is A: moderate parties supported the constitutional republic while extreme groups on both sides challenged it. A democracy needs parties willing to accept elections, a constitution, lawful debate, and compromise. In early Weimar Germany, moderate socialists, Catholics, and liberals helped establish and operate the republic, even though they disagreed on many policies. A is correct because such parties supplied democratic support between revolutionary left-wing and authoritarian right-wing forces. B is wrong because wanting dictatorship contradicts moderation and constitutional government. C is wrong because the Nazi movement was a separate extremist force, not an army run by moderate parties. D is wrong because the war-guilt clause was part of the Versailles settlement, not a task uniquely performed by moderate parties. Memory cue: moderates keep constitutional democracy alive between extremes.