The correct answer is D. The teachings of Martin Luther sparked the Protestant Reformation.
Martin Luther was an Augustinian Catholic friar and theologist who began and promoted the religious reform in Germany and whose teachings inspired the Protestant Reformation and the theological and cultural doctrine called Lutheranism.
Luther exhorted the Christian church to return to the original teachings of the Bible, which produced a restructuring of the Christian churches in Europe.
His marriage with Katharina von Bora, on June 13, 1525, initiated a movement of support for priestly marriage within many Christian currents.
