The correct effect of the Coriolis effect on the Gulf Stream and the Brazil Current is that it turns the Gulf Stream northeast and the Brazil Current southwest.
To summarize:
- The Gulf Stream, which flows in the North Atlantic, is deflected to the right (northeast) due to the Coriolis effect in the Northern Hemisphere.
- The Brazil Current, which is part of the South Atlantic Gyre, is deflected to the left (southwest) in the Southern Hemisphere.
So the first option you provided is accurate: "It turns the Gulf Stream northeast and the Brazil Current southwest."