The more effective research question among the options provided is:
How did the Treaty of Versailles contribute to German nationalism and militarism before World War II?
This question is more focused and specific, allowing for an in-depth examination of a significant event (the Treaty of Versailles) and its direct implications for the sociopolitical climate in Germany. It narrows the scope to a key factor and addresses the underlying causes that led to the war, making it more conducive to detailed analysis and research.