Why are currents along the eastern coast warm while those along the western coast are cold

Currents along the Eastern coast are warm while those along the Western coast are cold:

Because,

Due to the impact of the Coriolis Effect on the currents generating in the oceans, the direction and the motion of the waters flowing from north to south and vice versa is determined.

It is because of this phenomenon, the waters from the equator flow northwards from the east and the waters from the poles flows southwards from the west.

the awnser is a

it is not b or c