What was the main issue that sparked the Lutheran Reformation?

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The main issue that sparked the Lutheran Reformation was the sales of indulgences, which were pardons for sins that could be bought from the Catholic Church. Martin Luther objected to this practice, and his Ninety-Five Theses, which he posted on the door of a church in Wittenberg in 1517, called for a debate about the morality of indulgences. This ultimately led to a wider movement for reform within the Catholic Church, and the establishment of Protestantism as a separate branch of Christianity.

What Was the Main Issue That Sparked the Lutheran Reformation