Answer:
B. Germany launched rapid attacks with advanced technology that
overwhelmed defending armies.
Explanation:
Specifically, <em>Nazi Germany used the strategy</em> now known as the Blitzkrieg, <em>which combined aerial as well as armored divisions to quickly overwhelm armies</em>. Many <em>European countries were expecting another World War I trench warfare</em>, and<em> had their war doctrine built around such a fight</em>. The Blitzkrieg, therefore, came as a surprise, and <em>allowed Germany to quickly overwhelm the enemies</em>. 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.
Learn more about Blitzkrieg, here:
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