Why is it warmer in most of Europe than in northern California even though both are on the east side ...

Why is it warmer in most of Europe than in northern California even though both are on the east side of an ocean and Europe is at higher latitude than California?
 
  A) California weather is affected by the coastal mountains, which hold cold air along the west coast.
  B) Californians are just wimps; it really is warmer than Europe.
  C) California is affected by a cold offshore current, whereas Europe has the warm north Atlantic current, the continuation of the Gulf Stream.
  D) The famous California surf stirs up the surface water, bringing deeper colder ocean water to the surface.