The correct answer is B. This is because when Germany was defeated in WW1, they were forced to pay massive amounts of money as reparation and it harmed Germany's economy. With the economy being so bad, the Germans because desperate and listened to Hitler based on this desperation. Then with Hitler spouting rhetoric about rebuilding Germany and bringing them back to glory, he started WWII.
Be Proactive
Begin with the End in Mind
Put First Things First
Think Win-Win
Seek First to Understand, Then to Be Understood
Synergie
Sharpen the Saw
Answer: A controlled experiment is the only research method that can establish a cause and effect relationship.
Explanation: