Answer:
a.gulf stream
Step-by-step explanation:
Gulf stream is a very influential stream in the warming of the waters of the North Atlantic. It starts on the coast of Florida when it is at 23.8ºC and extends to Europe, arriving first in the United Kingdom, close to Scotland. This current provides warmth to the atmosphere and moves almost all over Europe, reaching regions around Norway, promoting a milder feeling of the cold atmosphere of these places.
The Gulf stream has a great capacity to cause hurricanes and intense tropical storms, due to its heat transfer effect.