The correct answer is B. Receiving money for the remission of sins
Explanation:
Martin Luther was, he was priest and theology that lived from 1483 to 1546 mainly known for his role on the Protestant Reformation and his position towards the Roman Catholic Church and the clergy. Indeed, during this life Martin Luther wrote different texts including the "Ninety-Five These" or "Disputation on the Power on Indulgences" in which Luther expressed his position towards the corruption that existed in the clergy and especially the use of Indulgences which was a practice in which people provided money to the clergy to reduce or be forgiven for the sins and which Martin Luther believed was part of the corruption and power in the church. Therefore, the act of the Roman Catholic Clergy Luther most strongly criticized in his ninety-five theses was "receiving money for the remission of sins".