Explanation

The Peace of Westphalia (1648) is widely regarded as the starting point of the modern state system. It established the principle of state sovereignty, ending the Thirty Years’ War and recognizing states as independent entities with authority over their territories. The Versailles Treaty (1919) ended World War I but did not initiate the state system, and the end of World War II (1945) is too late to be considered the origin. Hence, “None of these” is incorrect.