Final answer:
The passage suggests that a historian would explain the pope and clergy's arguments in the context of Protestant allegations that the Catholic Church had become corrupted by power. This corruption included popes acting like secular leaders and indulging in lavish lifestyles, which fueled the Reformation initiated by Martin Luther.
Step-by-step explanation:
The historian could best explain the arguments made in the passage regarding the pope and the clergy in the context of Protestant claims that the Catholic Church had become corrupted by power (B). The Protestant Reformation, initiated by Martin Luther in 1517, highlighted the church's issues, including clerical immorality, clerical ignorance, and clerical absenteeism. Luther's thesis and subsequent excommunication underscored a growing disillusionment with the Church's greed, abuse of power, and the sale of indulgences. This time in history saw criticisms that popes were behaving more like secular princes, involving themselves in political affairs, and commanding armies, rather than focusing on their spiritual roles.
Although there was mention of other elements such as lack of support for earlier Crusades against Muslims, the influence of Renaissance Humanism, and the failure to convert Muslims in Europe to Christianity, these were not central to the Protestant critique of the Church. The Protestant Reformation fundamentally arose out of concerns over morality and corruption within the Catholic Church, leading to a significant religious divide in Europe.