The correct answer is C.) "The practice of selling indulgences is corrupt and has to stop."
Step-by-step explanation:
Martin Luther was a German monk and theologies mainly known for his critics toward the Catholic Church and the influence these had on the Protestant Reformation. Indeed, in 1517 Luther wrote a document known as the Ninety-five theses to criticize some practices in the Catholic Church.
This included a direct critic of the sale of indulgences that implied priests and other religious leaders sold certificates that "reduced" sins in those who paid. This was extensively criticized by Luther who proposed this should end because Church leaders corruptly earned money through this practice. Also, Luther considered sins reduced through repentance and good acts. Thus, the statement that explains the position of Luther in 1517 is "The practice of selling indulgences is corrupt and has to stop."