Surface currents in the open ocean tend to curve in a clockwise direction in the Northern Hemisphere and counterclockwise in the Southern Hemisphere because
A.
the warmer water at the equator moves toward the poles.
B.
the continents act as barriers to the currents.
C.
the rotation of the earth is from west to east.
D.
the world's major rivers affect the currents as they enter the ocean.
E.
of the shifting of the continental plates.