Answer : Surface currents are driven by the winds.
Explanation :
Due to the rotation of Earth about its own axis and the Coriolis effect ( i.e. effects of earth's rotation ), the water present at the surface of ocean moves through winds. This leads to the formation of surface currents.
Coriolis effect depends on the the frame of references.
Wind blowing in ocean is responsible for surface currents.
So, the correct option is (a).
