What does europe use to transport goods throughout the continent?

Europe as transport its good over railroads.

Explanation:

Even though it might look incredible, European businesses transport their goods through railroads. The railroad network was not left to rust in Europe, it was modernized and it is one of the cheapest ways to travel as well as to transport goods. European land has rivers and is surrounded by the coast, but the inner land is filled with mountains, Riverlands, hills, and valleys. Making it challenging for the use of water to transport their resources. So, they improve their railroads every time they can to maintain the most effective transport net they have. Some roads were even made in the industrial revolution.

a and b because with the other three, they simplify to something else.