Here's a problem to solve: The mixing of cold Arctic Ocean water with warm surface Atlantic currents off the northwestern coast of Europe causes which effect?

Among the 4 following options, which is the correct answer?

- A: sinking of water as it circulates southwest
 
- B: reversal of current direction back toward the European coast
 
- C: rise in water salinity and upwelling of affected currents
 
- D: rapid evaporation and acceleration of currents toward the pole
 