The statement that best summarizes the outcome of the Thirty Years' War is:
Protestants and Catholics continued to control the same areas in Europe that they had at the beginning of this conflict.
While the war resulted in significant political and territorial changes, it did not lead to a complete upheaval of existing religious territories, and both groups remained in control of their respective areas. The Peace of Westphalia, which ended the war, confirmed the territorial status quo and allowed for coexistence of different Christian denominations.