Answer:
The good answer is:
b. Protestantism was recognized as an acceptable religion alongside Catholicism.
Explanation:
One of the main motives - but not the only one - of the Thirty Years War (1618-1648), fought mainly in Central Europe, was religion. It started as a conflict of faith, a conflict between Protestants and Catholics. It was a long and brutal event, with over 8 million casualties due to battles , famine and disease. As it went on, it became less a war about religion than a war abour hegemony in Europe. The Peace of Westphalia put and end to the war. It changed European geopolitics and the role of religion and nation-states in society forever.