Final answer:
Thomas Müntzer led the German Peasants' War, a failed uprising in the 1520s focused on bettering conditions for the lower classes.
Step-by-step explanation:
Thomas Müntzer was a leader during the German Peasants' War, a significant uprising in the 1520s that aimed to improve the plight of the lower classes in the Holy Roman Empire. This conflict is accurately represented by option A) German Peasants' War. Müntzer, influenced by the early waves of the Protestant Reformation that Martin Luther initiated, advocated for radical changes, ultimately leading the peasant forces in a revolt that sought not only religious but also social and economic reforms. Despite their efforts, this uprising was crushed, resulting in a failure to achieve its broader goals for the peasantry.