Which pricing strategy used by the medieval Catholic Church directly contributed to Martin Luther's protests and the Protestant Reformation?

Throughout history, religious institutions have employed various pricing strategies for sacred goods and services. From indulgences in medieval Christianity to tiered donation systems in modern spiritual centers, pricing has played a complex role in religious practice. This poll tests your knowledge about a famous historical pricing controversy that shook religious foundations and sparked significant reform.

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Sale of indulgences (certificates promising reduced time in purgatory)
Subscription-based tithing system (monthly payment plans for spiritual services)
Dynamic pricing for pew seating (prices varied based on proximity to the altar)
Premium pricing for illuminated manuscripts (luxury editions of sacred texts)