What made germany’s invasions of europe difficult to stop during world war ii?

What made Germany’s invasions of Europe difficult to stop during World War II?

A) Germany’s bombs and torpedoes

B) Germany’s powerful U-boats

C)Germany’s air attacks and fast-moving ground troops

D) Germany’s fast-moving sea attacks and powerful navy

You'er answer is

C) Germany's air attacks and fast-moving grounds troops

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a sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°c. if the system is at dynamic equilibrium, which of these statements is true?  

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