B. Germanic peoples lived in small communities governed by unwritten customs
The communities in Germany weren't as tightly organized with detailed legal systems or anything that robust and their communities were small.
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C. He provided an example for other Germanic leader
By seeing that such a notorious individual was converted to Christianity, the idea became less repelling to the other Germans.
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B. Rivers & D. Coasts
Viking were notorious when it came to raiding far lands in their boats. They became famous for their sailing skills back in their time.
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B. Frequent wars and invasions caused trade in western Europe to decline severely
The fall of Rome created many different state-cities and divided countries that would undergo through conflicts and wars from time to time. They also had to deal with vikings later on.
