Which 14th-century theologian and reformer spoke out against the principle of transubstantiation?

Yes, C.

https://www.christianitytoday.com/history/people/moversandshakers/john-wycliffe.html

King Henry VIII

Johannes Kepler
John Wycliffe
Pope Gregory XI

I feel like it's C but I'm not entirely sure though.

You're welcome.

Thank you!

The 14th-century theologian and reformer who spoke out against the principle of transubstantiation was John Wycliffe. To find this answer, you can follow these steps:

1. Start by understanding the question: The question is asking about a theologian and reformer from the 14th century who opposed the concept of transubstantiation.

2. Research the topic: Begin by looking up information about theologians and reformers from the 14th century. You can use search engines, online encyclopedias, or historical sources to gather information about individuals who were active during that time period.

3. Identify the theologian and reformer who opposed transubstantiation: Among the figures you research, look for someone who is known for challenging the principle of transubstantiation. Read about their beliefs, contributions, and any historical records that mention their stance on this specific topic.

4. Verify the answer: Once you have identified a potential theologian and reformer who opposed transubstantiation, cross-reference the information from multiple credible sources to ensure its accuracy.

In this case, after conducting the above steps, you will discover that John Wycliffe is widely recognized as a prominent figure who challenged the principle of transubstantiation during the 14th century.