Answer:
B. Germany launched rapid attacks with advanced technology that
overwhelmed defending armies.
Explanation:
Specifically, Nazi Germany used the strategy now known as the Blitzkrieg, which combined aerial as well as armored divisions to quickly overwhelm armies. Many European countries were expecting another World War I trench warfare, and had their war doctrine built around such a fight. The Blitzkrieg, therefore, came as a surprise, and allowed Germany to quickly overwhelm the enemies. It also helped that they were allied with the USSR, and so after defeating Poland, they only had to deal with combined resistance from western Europe.
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