In winter, although many parts of Europe have heavy snow falls, the sea ports remain ice free and ships come and go. What could be a reason Why the sea ports remain ice free?

A.) A warm ocean current flows along the coast

Explanation:

The sea ports which remain ice-free are called "warm-water ports." Other than those that can be found in Europe, warm-water ports can also be found in New York and Canada. This is due to the warm ocean current that flows along the coast in these areas. This allows the area to be free from ice, thus ships can just come and go. It is said that the "Gulf Stream" is responsible for bringing the warm water to Europe. However, other countries have cold-water ports just like in Russia.

i think it's a but not entirely sure