How many legal classes made up the Estates-General?

The Estates-General was composed of three legal classes, which were fundamental to the political structure of France prior to the French Revolution. These classes included the First Estate (clergy), the Second Estate (nobility), and the Third Estate (common people, which encompassed the vast majority of the population including peasants, city workers, and the bourgeoisie).

The significance of this tripartite structure lies in the social and political dynamics it represented. The Third Estate was often underrepresented in the decision-making processes, despite comprising about 98% of the population. This imbalance contributed to widespread discontent that ultimately led to the Revolution.

The other options do not accurately reflect the historical organization of the Estates-General, as there were specifically three distinct estates recognized during this period. Thus, the answer is appropriately identified as three.