Respuesta :
Usually they use rivers to travel because they often use boats so the answer is B. Rivers
Coasts and rivers!
The vikings were skilled sailors who would pillage all along coasts and rivers in Europe.
Source (my online textbook) (I put key phrases in bold):
These expert sailors and ferocious fighters burst out of Scandinavia, a northern region that now includes Norway, Sweden, and Denmark. They looted and burned communities along the coasts and rivers of Europe from Ireland to Russia.