Martin Luther's first attack on the Roman Catholic Church centered on what issue?

Question

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Luther's first attack on the Roman Catholic Church was on the issue of the sale of indulgences to raise funds for the Church. He strongly objected to the practice of selling indulgences, which promised to reduce a sinner's time in purgatory or even grant them forgiveness for sins in exchange for money. This was a major source of controversy and served as the catalyst for Luther's opposition to many other aspects of the Church's teaching and authority.

Martin Luther's First Attack on the Roman Catholic Church Centered