Martin Luther started the Protestant Reformation "by writing a list of grievances about the Church."
This is evident in the fact that Martin Luther wrote the 95 Theses, which challenged the central belief of the Christians at the time.
His 95 list of grievances covered the many issues, including the Bible is the main religious authority and that human salvation is dependent on their faith and not deeds.
Martin Luther was a German Protestant who lived between 1483 to 1546.
Hence, in this case, it is concluded that the correct answer is option C. "by writing a list of grievances about the Church."
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