The major influence on the climate of western Europe is due to the North Atlantic Drift an extension of the gulf stream. Hence option B is correct.
The North Atlantic drift is a current that forms an extension of the gulf stream and forms a powerful warm western boundary within the Atlantic ocean it extends northeastwards.
As the current originates from the gulf stream it turns southeast of the newfoundland rise that is a ridge that separates it from the grand banks. Most of Europe gets heat from this current in winters.
Find out more information about the North Atlantic Drift.
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