The correct answer among the choices is the last one:
“by rejecting the idea that the Church hierarchy had special powers”
A lot of corrupt practices were rampant or practiced in the church of God during Martin Luther's time. It was high considered or believed that priests were the only one who know God and the bible. Then the priests used this misbelieve ignorance of the Christians to exploit over them. Martin Luther preached against this while claiming that the priests have no special powers opposed to what is commonly preached. All in all, the actions of Martin Luther greatly helped in the reformation of Christendom.
