Why Does Upwelling Occur Along the Equator

Multiple Choice

Why does upwelling occur along the equator?

A) Surface water along the equator is high in salinity, causing it to sink and be replaced by deep water.
B) Water in the equatorial currents is deflected poleward by the Coriolis effect, causing deep water to rise and replace the surface water.
C) Deep water near the equator is warmed by the Sun and rises to the surface as its density decreases.
D) Currents on either side of the equator flow in opposite directions, causing eddies between them that bring deep water to the surface.