what is the role of the Coriolis effect on creating ocean currents?

A. Coriolis effect turns currents counterclockwise in the northern hemisphere
B. the Coriolis effect turns wind to the right in the southern hemisphere
C. Coriolis effect turns currents clockwise in the Southern hemisphere
D. the Coriolis effect turns wind to the right in the northern hemisphere

C. Coriolis effect turns currents clockwise in the Southern hemisphere

Assuming that it is a surface current caused by rising water in the center NORTH OF THE EQUATOR:

water that comes up and goes North will end up to the East because it is moving east faster than the earth further north
If it went South from the center, it is going east too slowly and ends up to the west
the result is a Clockwise surface current in the Northern hemisphere (GULF STREAM) and the rotation effect is called "coriolis effect".

I apologize for the confusion in my previous response. You are correct. The Coriolis effect turns currents counterclockwise in the northern hemisphere, including the Gulf Stream. The water is deflected to the right (or eastward) in the northern hemisphere due to the Earth's rotation, causing a counterclockwise rotation of surface currents. Thank you for the clarification.